How can I protect my job from a toxic coworker’s false reports?

I have a coworker. He is making it his mission to ruin our workplace. We have gone to HR, and it is to the point where HR can only do limited things with him because he unfortunately is protected by ADA (disability clause). Mind you this person is using their limitations and resources to drag all of us in his workplace down and basically cause chaos everyday. Since he started working with us he has done absolutely nothing but report all of us, lie, spy, and build cases to try and take each of us down. It got so bad to the point where everyone over 20 people reported him and wrote emails to HR to have him removed. It is an entire invasion of privacy he was filming us, never doing his actual job hiding places and texting back and forth with management yet when confronted he would hid behind the fact that he has a disablity and is protected. HR basically tried to shut everything down and told him to leave all of us alone, do his job and gave him an ultimatum. It was really bad to the point where our manager tried to blackmail all of us because they were found guilty of helping him build cases. He is a master manipulator, liar, delusional, passive aggressive provolker. Fortunately HR was able to compromise with him and he is getting placed somewhere else to protect the integrity and endurance of the company. But he has decided that myself, and another one of my coworkers are on his list to drag down with him (we did absolutely nothing to him). I legit ignore him 24/7 but I have been in the office and written up more times than I can count because of accusations that he keeps making (and my boss never verifies cause she's in kahoots) i reported him but it does nothing cause they never submit it. he's constantly spying on us and watching our every move which I have absolutely nothing to hide. HR told me to just play it cool until they can get him out, but everyday it seems like he is being more instigating, petty, and I don't like when innocent people are involved.

How can I protect my job from a toxic coworker’s false reports?
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