You said he should have never coached again, anywhere (his career should have been over, according to you) after that game. And, yet, he didn’t coach that game. Because he wasn’t the PSU coach then. He had moved on. Franklin was the coach. Another poster mentioned the derogatory “Flo” to incidate that O’Brien’s OL recruiting (or lack thereof) left the cupboard bare, resulting in that situation.
Regardless, you wanted a guy’s livelihood ended over his poor coaching of a team he wasn’t a coach of. Stop being a mess.
Meanwhile, that guy had helped stave off the demise of this program, then gone on to take over a 2-14 squad and reel off 3 consecutive winning seasons, and 4 winning seasons (and 2 playoff berths) out of 5 before he also took on the GM role (which was a mistake) ... and after that, he was a successful OC at a top college football program, an OC on a pro team and is now the HC of a power 4 college football program. So I'd say it's pretty clear that even if that WAS him coaching that team he wasn't a coach of, your judgment was WAY off. But he wasn't said coach, which means your embarrassment is multiplied.
So you can try to claim you were responding to something you weren't responding to (and it wouldn't matter if you were), and can try to pull back your criticism from "he should have never coached again" to "he was mediocre" ... but you said what you said.