No, I consider reactionary thought to be simply a rejection of the Whig view of history - not the desire to revert to a prior state, but a belief that either at some point in the past we took a wrong path, or that we are on an inevitable path of decline. I suppose by my definition many fascists would count as reactionaries. For me, technology absolutely is the factor that makes your description of reactionary thought inapplicable to the modern age, but I also think that without significantly scaling back technology humanity is doomed anyway. I definitely believe that the ascendancy of technology is a "wrong path", and in the political sphere the ascendancy of liberal democracy is a "wrong path" also. I think if you squint, both technology and liberal democracy look like the same thing which is a progression toward freedom from constraints; in technology's case, material constraints, and in liberalism's case, social constraints. A progression toward freedom from constraints may also be referred to as increasing entropy; an increase in disorder over time. For these reasons I call myself a reactionary.

I agree but you can just say Left vs Right or Mechanistic-Materialist vs Organic worldview or something. When I say reactionary I mean the temperament and tendencies of people who either cling to a rotting order or try to bring back one that is out of date according to the material conditions of the world. I'm not referring to the timeless principles of society and statecraft. Fascism is of the right, of the organic worldview; it's a Revolutionary Conservatism in a sense. The reactionary mindset nowadays manifests in paleocons vs fascists, the paleocon says white people are killing themselves the fascist says we're being killed. Reactionaries essentially act like everything is out of control, human will means nothing etc. Revolutionary minded people put forward the idea that white people can actually be saved, it just depends on action.

Do you think, then, that demographic replacement is not quite the killing blow to Europeans that many others make out?

I think most of these narratives are defeatism or used to try to scaremonger people into voting for the GayOp Party. How many times have you seen 'once Texas flips it's all over for white people, the GOP can never win again!' or something like this? Since when has the GOP helped whites? I say it all the time but Civil Rights and 1965 immigration had more right support than left and 6/9 presidents since then have been GOP, so it would seem they're the foremost enemy of whites then.

That instead, both cultural decline of our societies, and mass migration, are both a consequence of lack of racial consciousness among whites?

Well it's a lack of power but power will come from racial consciousness. Jewish strategy is so effective because the average jew actively works for jewish interests. They spam mail politicians, calls, donate money to jewish orgs etc. Look in jewish newspapers and stuff, they have instructions for ordinary jews to do stuff to help jews. Of course usury is a massive cause of their power but their level of racial consciousness is unmatched, jews are essentially all organised into a worldwide mafia. This is what whites need to emulate if they are to gain power, we need to create what is essentially gangs/mafias.

Don't you think that mass migration and miscegenation are causing a general loss of ethnocentrism in all races but Jews, and this is the reason mass migration is pushed by the elites, to maintain their power?

Yes, our entire society is designed around alienating and deracinating people in every way imaginable. People see the endless propaganda in media but they rarely think about the psychological affect of the technological society. Our entire society is designed around avoiding the re-emergence of the Authoritarian Personality: suburbs, cars, non-walkable cities, small business being replaced by supermarkets, kitchen appliances reducing the need to leave the house as often. All of this breaks down communities and Social Capital which was the building block of the fascist revolutions.