This isn't a calm, mature trad. Possibly some demonic issue? He's tries to get attention by shocking us.
I think he may have some trollish motivation, although I do think he's play some (what he consider to be) "long game" to bring everyone over to the realization of the truth.
All I know is that I'd spend lots of time addressing his points, and then he just ignores anything I had to say, and restates the same points.
For all I know, this could even be someone like Nishant, who's come back, this time having adopted the tactic of making sedevacantists look bad.