You can make statistics say whatever you want.
Take out the game against UGA where he got hurt on the 1st series and it doesn't look as bad:
TD-INT: 5-4
QBR: 74
%: 63%
YPA: 7.8
Peterman broke his hand against UF on 3rd down. The next possession he went back on the field and lobbed a pass to a defender due to his broken hand. That piss poor stat is on Peterman for not telling the coaches he couldn’t play. Same as the UGA game stats are on Tua for not telling the coaches he needed to come out. In both cases there were capable backups on the bench so it’s not like they had to play or else.