Splitting hairs on the hair splitting - a country cannot revoke someone's citizenship if doing so leaves them stateless. At least, this is the UN convention of human rights apparently. Of course, in reality, the country doesn't deny entrance, but could just as easily detain upon entree.

You're right but sometimes they try to argue that they belong to some other state like the UK did in "Begum v Secretary of State for the Home Department [2021]"

There are plenty of countries who have not signed on to the UN Convention on the Reduction of Statelessness, including the US. So, yes, you can be left stateless by the US revoking your citizenship. However, pretty much only treason or voluntary renouncement could potentially lead to such a situation, and treason hasn't been charged in the US since the immediate aftermath of WWII.