This is correct.

Imagine the opportunities for fuck-ups that would happen if every ignorant, bonehead actor who was given a gun on set said, "Hold everything while I disassemble this MP-5 to check the barrel for obstructions, and unload every mag to verify that there are only blank rounds in it!"

Actors should definitely receive basic firearms safety training if they're going to be using guns on set, and they should have the understanding that even blanks can kill.

But it is definitely not their job to be gunsmiths.

Also, imagine a movie where all the real firearm safety rules were enforced.

Director: Okay, in this scene, you point your gun at the bad guy and say, "Freeze, asshole!"

Actor: But I must never point a gun at anything I do not intend to destroy! How about I don't pull my gun, and I say "Freeze, asshole, or I will pull my gun out and point it at you!"

Hey, better to be safe, right?

Which is why this happened. Hollywood thinks they are "special" and above the rules that apply to everyone else handling a firearm whether it taking it out of the safe to clean it, at a store, at the range, or on duty. The point is they are not above the rules. Had they followed the 12 golden rules we wouldn't be having this discussion.

That means actors and anyone handling a firearm are given training on the mechanical function of the guns, how to load/unload, and do a safety check.

Something that is driven home in every defensive shooting class, every CCW class, every hunters ed class is that ultimately the person who pulls the trigger is the person who bears responsibility for what comes out of the barrel.