I use the LibRedirect for various sites and half the time it either doesn't load Tweets or it comes up with a page that Nitter was flagged for serving illegal content.
To be fair on the second one, IIRC, that instance was flagged for being used to access illegal content hosted on Twitter, which was already publicly available. It was an automated report and the site was inmediately taken down because of it.
This is precisely what I was thinking. It happened a few times and later it worked again. I think it's just happening because it's not Twitter. It's just a redirect site so it's literally the same exact content.