I accounted for 'closed' hours. Hence 22/h. The incident in question was close to closing time, but there were 2 issues, one a declared emergency.
Likely, the problem was with truck 1 wishing to get to the emergency quickly. There was at least one queued landing hence the go-around demand after the crash.
It doesn't blow my mind, but at a major air hub like LGA I'm surprised there isn't a controller on site for callout?