I thoroughly dislike Facebook as much as the next person, but none of what you quoted constitutes evidence for a ban on discussing Linux on the platform.
Reading the post, it sounds like this may rather be because of incorrect categorization of DistroWatch and links to it than an outright ban on Linux discussion. So yet another issue with Facebook's content moderation methods.
Yes; the scope of censorship over discussing Linux at all vs the scope of censorship of linking to Distro Watch is vastly different.
If Facebook was removing links to an Pro-Catholic website for some reason but still allowed the discussion of Catholicism, Catholic Church groups, etc. You would be daft to claim that FaceBook is banning all Catholics and discussion of thereof.
