https://redlib.catsarch.com/r/ProtonVPN/comments/8ww4h2/prot...
I suppose you're free not to believe them, but I'm unsure what exactly you believe is happening here and what exactly Proton is lying about. Tesonet secretly owns them and has been running a decades-long misinformation campaign to trick you into thinking they don't? To what end? It's not like Tesonet is some nefarious company we should all be afraid of. What would they gain from lying about this if it were true?
And how can they make such an obvious mistake with their certs and then not make another one for the next decade? It's just not plausible.
At some point, you've gotta use some common sense.