Surely it depends on your company SOP's here.
If the SOP's require a stabilised condition by a given height or that a go-around be flown, then a failure to do that is a failure to follow SOP's.
I would consider that to be a major failure to follow procedure (as opposed to the many trivial ones that occur every flight such as forgetting to call MSA in the climb) and as such a potential check failure.
Whether or not a post flight review of the decision making process to determine the crews understanding of requirements for a stable approach would suffice or whether or not to fail the crew, I guess is a judgement call (I am not a checker). You have to ask what benefit is achieved by a further check/sim refresher after a thorough debrief ... maybe the FAA on board was a factor.
Tough call. Is your failure of the crew defensible? absolutely, so don't worry, the crew should have known better.
All imho.