This is a clear case of the "ad hominem" fallacy.
You are saying his argument is wrong because of who he is.
Just because he is doing something odd (holed up in Russia) doesn't mean he is wrong.
You are saying his argument is wrong because of who he is.
Just because he is doing something odd (holed up in Russia) doesn't mean he is wrong.
FTA "This specious reasoning is a special type of ad hominem attack."
This is identical to saying "Climate change doesn't exist because Al Gore flies in airplanes," or "Ralph Nader cannot be a critic of capitalism because he made a million dollars of his books."
Motivations have nothing to do with it, that is exactly what an ad hominem attack is. If you reject the argument because of the person's motivations, you are calling an argument false without evaluating the argument itself. That is broken reasoning, which is why the term "fallacy" exists.