As has been said, 93:20 is supposed to be a home area, sold via the normal general admission process. The club needs to do a full investigation of how Leeds fans (assuming there were Leeds fans) got in there and be transparent with City Matters, rather than trying to sweep it under the carpet. We know one was apparently moved from 107 but were there others? We know Leeds fans were in proper hospitality sections as there's incontrovertible video footage of them.
As others have said, many of us have sat in home areas in away stadiums over the years but mostly we've had the sense to keep our heads down and, even if we're clocked without giving the game away too obviously, most home fans are generally sound with it. I've taken both an Everton and united fan who used my son's seat and both behaved impeccably. I've had a Bournemouth fan I'd worked with, at a club sponsor, sat in front of me. He was no bother and openly admitted his allegiance.
The problem comes with the ones who don't keep a low profile, whatever area they're in but it's likely to be more of a problem in areas like 93:20, because the profile is slightly different.