They play less games than everyone else so they have less injuries, less chance of having covid knocking guys out, and they have a weak schedule. Their only remotely impressive game was Indiana who almost beat them, the rest of then teams they have played are average at best.
There are plenty of teams who have tougher schedules and played more games than Ohio State who should be in over them. The committee letting Ohio State into the playoffs is purely for money, and because they are historically good, nothing else.