Very informative and useful reply. I always learn something from you about contemporary Brazil, which in turn helps me to communicate to others about the situation in the country.

I know about the late Olavo de Carvalho, but are there are any other intellectual figures (philosophers, sociologists, anthropologists, political scientists, &c.) generally considered 'Right-wing' or 'Far-Right' who were/are popular on the Brazilian Right?

The overtly Far-Left parties being satellite parties of the PT that serve for PT a function is a take that I haven't heard before. Of course, parties being slightly Leftward or Rightward of the mainstream often do end up as—provided that they weren't from the very start—satellite parties deeply intertwined with the mainstream, and so it is not wholly unbelievable. For instance, America's CPUSA is often viewed in the circles of those extreme Leftists who run with Antifa, PSL, RCP, &c. as a satellite party and front of the Left-wing of the US Democrats.

If PSTU, PCB and PCO better resemble the older Marxist Left, where does PCdoB fit in relation to them? I read once that the (by Western standards) 'Far-Right' PSC had an electoral alliance with the PCdoB and that this was the exact reason for Bolsonaro leaving their party, out of disapproval. The average PCdoB voter seems to be super-woke, however. 89% approval for same-sex marriage according to: https://brasil.isidewith.com/en/poll/965633/1550182717. But even the PSL voters seem woke, with 81% approval according to: https://brasil.isidewith.com/en/poll/965633/3347843671. It seems more like, in switching from PSC to PSL (which merged with the more conservative DEM to form UNIAO) Bolsonaro went from allying with conservatives to allying with liberals. DEM had a much less extreme 32% approval, going up by 1% over the past four years: https://brasil.isidewith.com/en/poll/965633/1550182707. Now he's gone back to conservatives by allying with PL.

breeding grounds for future militants

You ruled out the probability of South Africa's EFF's (and BLF's) strange blend of social radical+ethnonationalist (EFF is explicitly pro-feminist, LGBT, &., see, for example, this image from their website: https://effonline.org/wp-content/uploads/2020/08/WhatsApp-Image-2020-08-09-at-13.09.24.jpeg) politics taking off in Brazil, because the wider Left is uncomfortable with actual black racialism.

But is ideological Far-Left violence resembling that of the military rule years probable in future even if black racialist violence is unlikely? After all, there is the 'conspiracy theory' that Dilma herself was supposed to have participated in bank robberies, assassinations and other acts of Left-wing extremism during those years, charges albeit which she has always denied.

I've also noticed that the Left's hierarchy is dominated by White and White-passing Brazilians, despite the fact the more non-white parts of Brazil are (predictably) where they are electorally strongest. Like all multiracial democracies, race seems to be a significant marker of political allegiance. In 2018, the most pro-PT areas, where Haddad got 70% of the vote in the run-off, were also those that are the worst off demographically.

That Globo—which Brazilians should probably take to calling 'Globohomo' at this point—has influence comparable to that of CNN and similar mass media outlets is certainly no surprise. I certainly believe that mass media has had and still has a massive impact on the impressionable masses' conception of what is normal and what is 'extreme', although it certainly also takes time to socially engineer people, and thus it may take decades of bombarding viewers with queers and trannies to make them flip sides on that question. The same method was used where I am as well, viz. initially portraying them as 'normal' and 'like us' and slowly shifting towards portraying them as having desirous and enviable lifestyles. Now they are effectively protected classes who can do almost no wrong. And if that is one of the chief causes of their normalization, it is clearly succeeding there too, because it is very easy to find overt Brazilian queers and trannies wherever Brazilians can be found online.

As for the linked Reddit video... Bolsonaro really is the 'Brazilian Trump'. The way that his support plummeted around the time of Covid despite it turning out in hindsight to be much ado about nothing. The way that his opponents label him with the exact same terms. The way they're accusing him of aspiring to launch a Peruvian-style auto-coup. The way they'll go after him after he leaves office.

Sao Paulo University looks every bit as bad as you say it is. Left-wing buzzwords everywhere (socialism, imperialism, LGBT, feminists, anti-racists). That's yet another analogue with Trump: just as Trump either couldn't or didn't even try to change American universities, Bolsonaro likewise has not changed Brazil's universities, and so they remained bastions of their enemies all through their time in office.