are they using the excuse of an unfortunate past to commit these behaviours?

This reasoning is exceptionally racist to even suggest. The logic that black people on the whole commit a higher rate of crimes enough to reflect statistically because they think it's ok because of their races' past, is a conservative talking point and a scare tactic.

It's like suggesting that, because white people tend to make it further in their careers, is it because society as a whole favors white people to be more capable of higher paying jobs? Or is it because white people actually have higher work ethic? The latter is racist to assert, even if you juxtapose it with the actual reasoning like it's supposed to be considered just as equally.

I am not saying to disregard the research as a whole

It seems like you're just brushing on the point but still missing it. Sure, the studies need to be made again with regards to the actual data. But the data is public. The conclusions can be made without published scientific work. Those help, but conservatives sure aren't quoting published research papers when they say things like "drag harms children" or "a fetus is a baby".

The point I'm making is that just bringing up that the guy who formalized the concept falsified his findings, is not enough justification to deny the people talking about their personal convictions to an audience willing to listen, and it's damn sure not enough for an institution to decide to snip and cut certain things such a group might want to talk about in a way that neuters the point.

The Tennessee school/government has an agenda, just as much as they might claim the group in question does. If that researcher hadn't have been deposed as a liar, they'd be saying the same things and making the same restrictions, just like they did in the years before he was outed as a liar.