I think only very obscure articles can survive for that long, merely because not enough people care about them to watch/review them. The reliability of Wikipedia is inversely proportional to the obscurity of the subject, i.e. you should be relatively safe if it's a dry but popular topic (e.g. science), wary if it's a hot topic (politics, but they tend to have lots of eyeballs so truly outrageous falsehoods are unlikely), and simply not consider it reliable for obscure topics. And there will be outliers and exceptions, because this is the real world.

In this regard, it's no different than a print encyclopedia, except revisions come sooner.

It's not perfect and it does have biases, but again this seems to reflect societal biases (of those who speak English, are literate and have fluency with computers, and are "extremely online" to spend time editing Wikipedia). I've come to accept English Wikipedia's biases are not my own, and I mentally adjust for this in any article I read.

I think this is markedly different to LLMs and their training datasets. There, obscurity and hidden, unpredictable mechanisms are the rule, not the exception.

Edit: to be clear, I'm not arguing there are no controversies about Wikipedia. I know there are cliques that police the wiki and enforce their points of view, and use their knowledge of in-rules and collude to drive away dissenters. Oh well, such is the nature of human groups.