Não, apenas os posts

Q: Does it synchronize comments?
A: No, that would be impossible. Considering there are thousands of posts already on Lemmit, many of them having at least several hundred comments on Reddit, often buried in deep layers, it simply wouldn’t be feasible to index those for more than a few posts, let alone keep them up to date.

FAQ https://lemmy.pt/post/512541

Há mais subreddits portugueses, fiz uma lista aqui https://lemmy.pt/post/512608