You mean an immunity deal that they now can't agree on? How does that work? "Hey, remember the immunity deal I tried to sneak in here on your behalf? Well, the judge found out I gave you this deal so now I won't give you that deal put everything else on the table and take you to court. See you later." There is nothing preventing them from reaching a deal if Weiss indeed wanted to "sneak immunity in." The lawyers simply don't agree to plead guilty on the parameters as they are now set so they are going to court.
But of course, it's much easier to simply assert bias no matter how non-sensical.
Let me do some very specific predictions. Chances are Hunter will be found guilty. More than likely the judge will sentence some form of probationary sentence. Paying taxes late and checking a box on a form corruptly aren't exactly capitol offences and Hunter would be a first-time offender.
This will cause the right-wing talking heads from which the good people right-wing people here get their talking points, to claim this judge gave the minimum sentence, or say something like the punishment for these offences is x-amount of years and this judge simply gave probation. Failing of course to mention it is the maximum possible sentence.
After which the people on this board will immediately claim amnesia of the fact that this same judge torpedoed the original plea agreement causing the existence of the trial in the first place and cry. The judge is in the bag for Biden.
Who wants to give me odds?