The chance that Underwood got a "$10.5 million wagon full of money dropped into his lap" are about 1 in 10.5 million
. So, "there's a chance"
The entire provenance of that bit was:
1) Some website/message board guru pulled a number out of a hat and said during his recruitment "Underwood's NIL value is $10.5 million" Whatever the heck that is.
2) Portnoy, the guy from Barstool - who is pretty much nothing but a fool and a self-promoter - wants people to believe he somehow rescued Michigan football by slathering Underwood in a swimming pool of $ (check out Mr Portnoy:
David Portnoy - Wikipedia)
3) The hard-charging journalists in sports media/blogosphere took off and ran with it as click bait.
Is Underwood getting $ shoved into his pockets to go to Michigan? Sure. Is it a large sum - by normal people terms? Probably. Would he also have gotten pockets stuffed with money to go to LSU, or anywhere else? Sure.
It is what it is. And that is the world of "college" football circa 2024.
To steal a phrase: That is what we are up against.