Per court documents, Kadar offered his services on the dark net, and he was paid in bitcoin, generating close to 184 BTC (around US$0.8 million at current prices) in the course of the career that started when he was a minor.
Yeah, if that fact was in court documents he doesn't own that bitcoin anymore. The Israeli or American Federal Agencies own this bitcoin now. I suppose it's possible he didn't share how to access his wallet(s) but that's debatable and unlikely. People usually cough up the information if the threat is great enough.