The quietest subsonic rounds will not cycle semi auto action handguns, so you compromise on speed of follow up shots for quietness, you anticipate stovepipes and failure to ejects.
The opposite could also be possible, this was a pro who chose to manually cycle the firearm with no gloves for improved dexterity. He didn't fumble when the firearm 'malfunctioned' he cleared it and finished the target, then exfilled successfully.
The quietest subsonic rounds will not cycle semi auto action handguns, so you compromise on speed of follow up shots for quietness, you anticipate stovepipes and failure to ejects.
The opposite could also be possible, this was a pro who chose to manually cycle the firearm with no gloves for improved dexterity. He didn't fumble when the firearm 'malfunctioned' he cleared it and finished the target, then exfilled successfully.
This is exactly how I see that video. Lots of unknowns but people jumping to an amateur operator I think are incorrect.