Extraditions can take a long time and I bet covid played a role in this taking 3 years. I don't know if he was in custody the entire time but I would take a guess and say he was because of the crimes he's charged with and the fact he was a fugitive. It looks like some of his hearings were under a publication ban as his name is redacted in some of the stuff I was able to find and that would explain why we are just hearing about him now since he was finally extradited.