There are tens of thousands of posts with the word "cisgender" at the moment on X. So, I think this "ban" is currently only in one's febrile imagination. Putin does not allow tens of thousands of opposition politicians, so the analogy also does not hold.
Its an extremely big difference from the Biden era where any post critical of the vaccine and backed up with papers was taken down pronto. This was even confirmed in several senate hearings.
https://www.axios.com/2024/08/27/zuckerberg-biden-administra...
https://www.cnbc.com/2025/01/10/mark-zuckerberg-says-biden-p...
As a non-American, I was very happy when Musk bought out twitter - it was ridiculous being unable to criticize vaccines - you couldn't even articulate the Indian government's stance on Pfizer and how Pfizer refused to provde test data. "Freedom of speech" was utterly non-existent in that era.