You're not wrong about the fact that it's a probable problem on his end, but you are totally wrong about your reasoning why!
It's not because "A Zombies Life" is made by a different dev, it's because "A Zombies Life" is made with completely different RPG Maker engine.
P.S. And also your response was in no way helpful at all.
If you often experience freezing in RMMV games (games made with RPG Maker MV), like for example here "Zombie's Retreat" and "Zombie's Retreat 2: Gridlocked" and also "Town of Passion" (all of them are RMMV games).
You should look at this thread
here.
But if you also are experiencing freezes in other RPG Maker Games (that are made with RPG Maker XP, VX or VX Ace) or games in general then the problem could be more serious.
Investigating various hardware driver issues is a good troubleshooting start in that case (generally you start troubleshooting software side runtimes then drivers and then move to hardware).