I'm sure Beltrami will be back for the third film in the main franchise.
The fact that he didn't do a standalone with an entirely different cast and crew doesn't suggest to me that he's left the franchise.
Also, I'm thrilled the director of A Quiet Place: Day One was able to bring his composer from Pig, I think the score is absolutely beautiful and perfect for the film, which I loved even more than the first two.
IN THE HEAT OF THE NIGHT (GREAT score by Quincy Jones) THEY CALL ME MISTER TIBBS! (GREAT score by Quincy Jones) THE ORGANIZATION (GREAT score not by Quincy Jones)
Can only imagine Lalo's Amityville III being just as great, had he stayed he would've defined those choral motif's even more delightful the brooding end to, those screeching strings too man the pitched cello's that popped up & down Lalo's silky piano skills.
I dare say Lalo saw III & thought yuk, he'd be right the film stinks, Blake's score is appreciable but its not Schifrin level.