As has been discussed to death here, Google’s hiring process doesn’t care what you did last week, or last year (eg Max Howell).

This would not improve his odds.

Anecdotal, but I got my job at Google through participating in their bug bounty program. The first set of interviews you have that ask general CS questions might not care what you did last week or last year, but when you talk with the team who wants to hire you they certainly do care.

That's the thing, he might get rejected from the screening questions...