Possibly. F4om what ice,read, he was using subsonic rounds, and with a suppressor the gas would not be sufficient to automatically re-chamber a round, hence why people are saying the weapon jammed; he was just re-racking after every shot.
It looked like all the bullets had writing on them, he knew he only had to hit 3-4 shots, so he filled the mag with 8 rounds and just force reloaded. Two live rounds ended up on the pavement when the gun cycled and he ejected it.
If it’s a Statiin Six 9, it’s a bolt action pistol, necessitating racking the slide before each shot.