I took the time to find and read an article about the details, and to me and probable the author, this is bill sponsored (zero co-sponsors at this time) to forward some legislation based on extremely racists language of existing laws when the USA acquired Puerto Rico:
In the lead case, Downes v. Bidwell, the court ruled that Puerto Rico belonged to — but wasn’t part of — the United States in a constitutional sense, and used language like “alien races” and “savage tribes” to describe people living there. The doctrine’s author, Justice Edward Douglass White (a former Confederate soldier), built the reasoning explicitly on “differences of race,” warning against extending citizenship to “uncivilized race[s]” he deemed “completely unfit to receive it.”
So in part, it’s a callout to the worst racists in MAGA, using the veneer of law.
The second point from the same article, is that it seems deliberate in it’s efforts to create confusing language that could be exploited down the line. Yes, as the OP points out, Puerto Ricans are US citizens, but that doesn’t come up until the very end of the language of the bill.
That’s not paranoia. Efrén Rivera Ramos, a law professor and former dean at the University of Puerto Rico School of Law, told “Democracy Now!” that the bill’s own drafting creates exactly this kind of ambiguity — the first part reads as if it strips citizenship from anyone born in Puerto Rico after 2027, and only in the bill’s very last provision does it narrow that down to children of noncitizens and non-permanent residents. That sloppiness, Rivera Ramos warns, “may cause problems in the future” if this bill ever becomes law.
So, based on the article, and my opinions, it’s calling out to the very worst part of MAGA’s base, and if(!) it passes, will be used as yet another pretext to challenge Birthright Citizenship, since Trump failed to appeal the 6-3 SCOTUS decision.
And, of course, even if it doesn’t pass, MAGA can point out at more legislation they proposed to deal with “them” that was thwarted by the eeeeevillll Democrats prior to midterms.