No, they weren't. The coaches were out with COVID, had nothing to do with the allegations. Gray was cleared by UT Compliance on Saturday, per Chris Low of ESPN, and would have been available for the game if it had been a night game instead of a noon game.
You can't self-impose a bowl ban the day bowl announcements are made and expect to receive credit for it, anyway.
Here's the thing about all of this: These type of internal compliance investigations go on all the time at every school. Most of the time, they end up producing nothing or little more than a trip for coaches to a rules eduction seminar. Someone wanted to try to drag Pruitt through some of it here. I'm told by a friend in the media up there that whoever leaked the story to Wallace had tried to get other media members to report it a week or more ago. But after vetting the story, they all passed because the nature of the investigation is likely to lead to no serious issues. Wallace went with it and there's nothing wrong with that, it just made what typically would have been a non-story into another thing on the list at the end of a long season.