For the sake of this discussion I'll accept your info about these studio heads being Jewish? And then what? Here's where this can go downhill. These people, who are Jewish, work for their respective studios. There is nothing that binds them, other than they're of Jewish backgrounds of diverse and varying degrees. They don't have secret meetings in "Jew World." They don't make decisions for their studios for the betterment of Jews or Israel or AIPAC, etc. Their decisions are made solely for the betterment of their respective companies. They probably differ from one another in many ways, politically, religiously, socially, etc.
I have no problem with anyone saying that Jews have figured prominently in Hollywood since just after its beginnings until the present because it's true. But it's what some people do with that information that can be troubling. If they take that info to tie it into a historical canard that Jews run the show and are all connected to each other in a conspiracy masterminded somewhere then yeah, that's antisemitism. It's like saying there's a group of Jews who meet every Saturday night in lower Manhattan after shabbat ends and while playing pinochle they conspire to get their scheming hands on every aspect of the U.S. government and economy. Sadly, there are still many people who think that this is how the world really operates.