It is odd, I agree. But on this specific topic I saw a) this weird tone shift seemingly overnight - while I really don't want to make this personal, a prominent individual adopting a quite different communication style to what they'd used before. And it came coupled with b) these inconsistent arguments that just don't make sense. Signal pushers smear those who disagree as "crypto nerds" and yet perfect forward secrecy, the one advantage their system has and the thing they use to argue for all the compromises they made in every other area, is the ultimate "crypto nerd" property: it's elegant and theoretically exciting but practically almost useless (I don't think I've ever seen a threat model where it actually makes sense).