Could you show us the page where the widget is broken?

The NEXT Wiki.

I think Weibo is no longer supported, but using a Dev script, you can, but I forgot the name of the script

I am just curious where you saw information about the Weibo widget. I don't recall ever hearing about it or seeing it except for one other thread a long while ago where someone else was also trying to use it but it wasn't working. Also, for anyone who wants to know, this is the wiki they are talking about. Took a while to find as it isn't among the top results when you just search for "NEXT wiki".

It's unparsed there too, and it's made in 2019, so I think this was a previous feature on Legacy, or am I incorrect?

Well, assuming it worked, I suppose if would have to have been. I don't see any JS on that wiki to indicate otherwise. I just also don't recall ever noticing it work on a wiki and I can't find a mention of it in the past versions of the social media integration help page. Though with so many revisions, it is always possible I just missed it.