Excuse the source, but this article has a bit of context about Khameini's tweets and the repeated call for their deletion:

https://nypost.com/2020/07/30/twitter-execs-refused-request-...

This tweet is particularly famous:

https://twitter.com/khamenei_ir/status/1263749566744100864

Honestly I don't think Twitter's removal of the Xinjiang tweet had anything to do with foreign policy at all, it just made feminism look bad, which does actually crush birth rates (even if that's not what happened in Xinjiang). Right-wing Twitter was exploiting the CCP tweet for this alone.