I hate making excuses for cops with shitty training, but:
Current TCCC protocol is if you have a gunshot wound in an extremity and have an approved TQ handy, slap it on.
There is almost no downside (except pain) and it saves you the lost blood figuring out weather or not a pressure dressing will suffice.
They probably did the right first aid.
Of course they apparently allow police officers to use Serpa's , so they better have good first aid training.