It's definitely not an actual audition. It's just interesting and random he'd be doing this little network synergy sketch now when TAR30 is long done. It would've nice to maybe have back in January to get a couple more eyes to TAR, you know?
At the same time, someone definitely told the intern running TAR's social media accounts to keep an eye out for the fans' response to even the slightest possibility of celebrity Racers. No doubt it's on Moonves' mind after CBB. So gauging public interest in a possible celebrity Race is not far-fetched.
If CBS plans on returning TAR to twice a year starting in the Fall, then making one of them a "gimmick" season (celeb season included) and the other a normal season is... okay. But if TAR31 remains a benchwarmer next season, I think it's not a good idea to go gimmicky or even a contrived theme season.