He probably is having loyalty problems but this article doesn’t seem to support your point. It only discusses one person, who is a colonel and appears to claim he was a traitor from the beginning. It says there were two colonels involved in an assassination plot but that there is reason to doubt the SBU’s veracity.
I’m not sure what point the article supports.
Also, since Ukraine’s constitution does not allow for elections during martial law it doesn’t seem accurate to say Z specifically suspended elections but that he enacted martial law which entails suspending elections. Honest question: isn’t this a normal scenario for declaring martial law? That is, wouldn’t Z have declared ML even if he wasn’t a corrupt piece of shit?