The most interesting - where public opinion was against and Rootclaim was for, and it was later shown Rootclaim was far more likely to be right - seem to be the deaths of Barry and Honey Sherman [0] and that MH370 vanished due to pilot suicide [1].
I think where the rubber would meet the road is if they're ever shown to be correct about the Syrian chemical attacks [2], where they draw the opposite conclusion Bellingcat did, and of course about the COVID-19 origin.
If they do turn out to be right about those, that would grant them major credibility points, I think; though the conclusions there may never be known one way or another. If they are right about COVID-19, it would also make me view Bret Weinstein with a lot more credibility, since he's been advocating the likelihood of the lab leak hypothesis for a while.
[0] https://www.rootclaim.com/rootclaim_track_record#barry_and_h...
[1] https://www.rootclaim.com/rootclaim_track_record#MH_370
[2] https://www.rootclaim.com/rootclaim_track_record#syrian_chem...