There are various reasons Lemmy succeeded as a Reddit alternative where others failed. One of the underappreciated ones is probably that the devs were communists. I know that sounds a little strange
Considering the article used "tankie" unironically and referred to a far right instance owner as being "pretty chill" I think it's safe to guess the political leanings of the author.
Whatever the authors leanings are, they make a good point. Lemmy has followed Karl Popper's maxim "Tolerant societies must be intolerant of intolerance." It's just that simple.
I mean moderation doesn't neccesarily support that. You can be tolerant but remove stuff that is far in the fringes. Lemmy has quite a mix. World hates left wing, ml is left wing. Ee is pretty open.
Being intolerant does not necessarily mean complete exclusion. Like one-way federation is still allowed right? So if some folks wanna comment they can still get the same content, the folks who don't won't. I think that's a decent middle ground for the meantime.