I have a sandbox of Star's profile, and others that are effect by this.
I believe these are the ratings, Shigaraki should not only be capable of withstanding a single missile. But he took multiple 100% punches from Izuku, who is stronger than he was during the events of Heroes Rising (
High 7-A+). And the feat was performed with the air pressure coming from his punch, while Shigaraki took direct hits.
I think baseline High 7-A+, or 2.65 GT is a good rating for him and the High-End Nomu. (Of course these ratings can change depending on the direction of the CRT, and this isn't complete.)
Yes we should all probably wait until that thread, I'm just hoping to publish Star's profile whenever that is possible. Also Mirko's ratings are not really all together right now.