He vaguely alleges it was stolen from him. Of course, he's absurdly vague because he knows nothing about Cobra or the history of the domain (beyond whats been posted) he's currently unable to usefully construct any forgeries to support his lies. It's a safe bet that a big part of why he's obsessed with doxing cobra is to facilitate taking the domain by force.
I'm certain that much of what W does is a fishing expedition. The more W knows, the better W can start making up stories that more closely pertain to facts (those pesky things). Right now, all W has is a half baked story that doesn't align with reality in any way.
W will one day end up in prison, and will lose his current fortune. He hasn't yet because he hasn't pushed enough - even though he has pushed hard. W's stories do not align with the history of bitcoin itself, along with many other things. (We're supposed to believe that the inventor of a cryptocurrency wants to renege on the rules of software that he supposedly invented? If it were a card game, that would be called cheating. He blames others for lost multi-millions because he wiped his own drive.)
I know that we in this forum know he is a fraud, yet I feel it important to repeat so that new people know.