This should cause a significant degree of cognitive dissonance for quite a lot of Hacker News users. fascinating to see two members of the billionaire tech class disagree publicly like this.
As far as social media, if it all goes away I wouldn't be that concerned. Net neutrality and access to basic Internet services for all is a much more important issue, IMO. Blocking servers from the Internet (unless they're actually hosting criminal content and taken down by legal prosecution) would be the more serious free speech violation.
(I am centre-right by my country's standards, yet my perception of HN is that it leans even more right)