He was black balled when Saban tried to hire him as his OC in 2018. By the time Auburn was doing the coaching search to replace Gus, I think that had worn off. Auburn hiring Freeze this time would be a horrible look after trying to get Harsin fired for, among other things, banging an assistant.
As long as YF is calling the shots there, I don't think he'd want Freeze. Freeze has a name/reputation of his own, knows what he is doing, and wouldn't do something just because a booster told him to. Everything I heard out of Auburn was that YF wanted Steele, and nobody else, to have the job because he's close personal friends with him. Auburn is really between a rock and a hard place because he appears to have dictatorial-level powers among their booster base; they can't play off various factions of boosters like Danny White could when he took the job. Danny could come in and plausibly claim "We've tried all the boosters' ways, and they have failed. Let me pick a coach" and got people to go along with it. I'm not sure Auburn can do that right now.