… a sudden pitch down as opposed a "mushing" stall?
IIRC this is not what it implies. Any change in pitch depends on the pitching moment characteristics with CL and alpha; so depending on aircraft type the ‘stall’ might be ‘mushing’, a nose down (self recovery), or even nose up.
From the original question / quote, it might be assumed that there is little pitch changed, thus the stall identification is predominated by the ‘g’ break.