I would tend to agree, but don’t know if this tells anything meaningful about the weapon used, other than they were automatic.
Clearly the fire came in large bursts, followed by sllence, then another large burst... this wasn’t someone trying to maximize accuracy... fire a few rounds, re-aim fire some more... etc... this was squeeze until clip is empty.. reload/change weapon, repeat...
Definitely not controlled breath, exhale, half through breath hold, clear front sight post blurry background, slow steady squeeze, follow through