The NY Post story says the allegations of rape and how he died are unsubstantiated.
Yet you are claiming that he was raped and also making a claim on how he died.
How do you know those things? Do you have a reference for your claims?
Yes. Unsubstantiated. Those are the rumors.
Thd rape part was reported by the Belorussian (anti-Kremlin) news agency Nexta.
https://twitter.com/nexta_tv/status/1781376341750804484
I would class this as rumor.