This is probably true, and the amount of butchering in this movie reeks of studio meddling, like has happenned with Justice League, Suicide Squad, Rogue One, Solo, etc.
But maybe they were trying to "save" the movie or make it shorter to gain more viewings and money because they knew it was bad, because on the other hand, this is from the director of Iron Man 3, a movie that has the exact same problem as The Predator: It had nothing to do with the universe it was set in.
Both movies have characters named after the Iron Man and Predator worlds, but there is nothing that resembles those characters or tone or anything.
So i take that Shane had no idea what he was doing and was just doing his own thing with disregard for all the previous movies.
A lot of people, and i dont mean just here but everywhere, defend the movie only becaue Shane made it and has a filmmaking style that they love.
I dont know who he is, i only saw Iron Man 3 from him, and is also an awful movie, so i am gonna put the blame on him.
Also, did Shane not made the leaked script along with Dekker or whatever is his name? The script that was even more stupid than the movie we got? If so, there you have your answer, they just made a bad script.