I need some clarification.
Is the hearing in front of judge in PR regarding the plea deal a mere formality?
Is the plea deal, as reported, a fait accompli, or can the judge impose conditions.... such as admission of facts before granting the deal? Or even reject the plea deal?
I am not certain, due to two things: imprecisions in the reporting and not knowing Puerto Rico criminal procedure. In my practice, a "plea deal" was something different from what we in shorthand called a "plea with a recommendation", with the first being a more formal agreement as to the outcome of the case re the plea and the sentence. Yes, the judge has to agree, and if the judge does not, you can back out of the plea and the case continues as before, sometimes with a new judge.
A plea with a recommendation means just that: a deal that if the defendant pleads guilty, the prosecution will recommend a certain sentence, but the defense can try to persuade the judge to do less than that. But the judge can do more than the prosecution recommends, too, and the defendant is likely to be stuck with it. I don't know which this is.
In many cases, especially when there's a plea deal, the judge, prior to accepting the plea, will ask the defendant a series of questions. This is called a "colloquy". This varies from state to state, and the judge can ask other questions too, but the judge will ask if the defendant understands that by pleading guilty he is giving up the right to a jury trial the verdict of which must be unanimous, the right to present a defense, subpoena witnesses, obtain documents, if anyone has made him threats or promises re his plea (not counting the plea deal), if he's satisfied his lawyer has competently advised him, that sort of thing. Only then will the judge accept the plea.
I don't think the judge can insist that SA adopt the prosecution's version of the facts. But he needs to satisfy himself that SA is pleading guilty because he believes himself guilty. How deep he delves on that point, your guess is as good as mine.
I would expect this to go through without difficulty, simply because these seem to be very competent lawyers who deal with PR law routinely who have come to an agreement. But yes, the judge could cause a lot of problems with the wrong (right?) questions if so minded.