Take a closer look. It's obviously some kind of concealer painted on and not actual hair. He uses this stuff regularly, he just lapped it up extra thick this time so it's fairly obvious. If he had a transplant done it wouldn't have grown back that fast.
With all that money it's hard to imagine why he wouldn't get some FUE done though. If it were me I would've had an appointment booked the minute that first check cleared.