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I think the intent is: the previous discussions were some time ago and may be out of date, so those links may not be relevant.

Probably more outdated than irrelevant.

"That" refers to the previous discussion just mentioned, and "now" confirms it by contrasting with 1 or 3.5 years ago. The point is that it is possible some of the criticisms and problems discussed back then could have been fixed since then (though I don't know, hence "may").

Please do not downvote questions like this (the comment is faded out as I'm writing this). It's a genuine question from a new user, possibly a non-native English speaker, trying to understand someone's comment.

Thank you for the support. Yes it was a genuine question. I am not native English speaker. I was trying to understand the comment.