While I know nothing about the company involved, a low approach and go around (as a planned maneuver) takes pretty much the same airport resource as a T&G so I don't think it is any more unreasonable to charge this than a T&G. IIRC there was a rant thread on this and the conclusion was that an ATC initiated Go around or a non-training one (i.e. a real safety issue) were not being charged.