The articles are crap.

Basically they just use spectrometry to detect elements. They've found evidence of a molecule that we know is made by life on earth.

It's a bit like saying "carbon dioxide comes from plants so if we detect carbon dioxide it is an indicator of life" which is true. But we find loads of carbon dioxide on venus and there's zero life there so it doesn't really mean anything.

This element makes a stronger case than carbon dioxide but the basic premise is the same.

Also worth mentioning that scientists once speculated that Venus had jungles before we knew more about it and the literal hellscape that planet is.

I tend to think the assumption being made is that since life is everywhere on Earth we expect it to be everywhere in space as well but so far my opinion is that explorations of space have indicated it to be entirely sterile and while that doesn't preclude the possibility of life in space it does lead me to be very skeptical of any claims that it exists. As so far everywhere we've investigated is totally sterile save for what we've brought with us.