I think he's a bit out of his depth with the self-driving startup and bigger projects he's undertaken, but when it comes to CTFs and hacking competition, he's pretty damn good. Idk if he still does, but for a while he competed until tomcr00se and he'd always be at the top of the leaderboards for nearly every competition. I don't think that's just luck or plagiarism.

You can see him in top10 of US [0] during 2013-2015 when he was most active, that's not a trivial feat.

[0] https://ctftime.org/stats/2014/US