The person behind nitter.poast.org, as seen here, has been outed as some reactionary former dev of 4chan: https://accollective.noblogs.org/post/2021/06/18/admin-of-poa-st-anime-graf-mays-revealed-daniel-stevens-of-ontario-canada/ (CW: racial slurs)
He is also the admin of Poast, which is a reactionary instance on the Fediverse, reactionary to the point where even MSM had articles about it.
Needless to say, I'm going to use another Nitter instance (nitter.esmailelbob.xyz) and I would encourage others to do the same. Here's a list of Nitter instances: https://status.d420.de/ in case nitter.esmailelbob.xyz turns out to suck as well.
Edit: Damn, it turns out esmailelbob sucks as well lol
I stopping using that and trusting that site about a month ago. As far I know - I tried all the instances repeatedly - nitter.poast.org was and is the only working instance.
nitter.privacydev.net was very healthy or fully healthy when I checked the status but it I entirely gave up on it ~2 months ago. For weeks on end it never worked.
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I moved on to Bluesky.