the appearance of impropriety is impropriety.
the simple fact is the judge reads the accusation and can just say “nope, i can be fair.” and that ends it.
If granted, EVERY RULING of the judge can be re-examined.
It’s about time!
On the other hand, it could be that the defense has let the Judge have enough rope to hang himself?
A decision adverse to Zimmerman can be appealed. You can see cites to handful of appellate cases on disqualification, in O'Mara's motion. The fact that the motion was filed, at all, puts the court under a cloud of bias and partiality.