Lemmy is a link aggregator, this guy posted a link to his website and a brief (albeit lacking, I will agree with you there) description of what the links were. I don’t see any issue promoting free content in the forms of links on a link aggregator.

I also think there’s sort of a social agreement that if you’re going to make a comment about a post that exists purely as a link to elsewhere, you should probably click the link so that you know what is being discussed instead of what we’re doing, discussing the link itself lol.