I don't really have any investment in TF2.
But if I were involved with the #FixTF2 movement, I'd want it to be careful not to make the big wigs at Valve want to just slap Valorent-like anti-cheat on TF2.
It does seem like the page for #FixTF2 talks about zero tolerance policies and basically manually banning people based on reports. But not explicitly saying in the petition to Valve that kernel-level anticheat is not the solution seems risky.
Edit: Ok, looked a little closer. It doesn't seem like #FixTF2 is really against invasive client-side anticheat measures. They talk about "updated anti-cheat measures" as something they want, but don't put any qualifiers on that. That's unfortunate.