Comparisons with Habsheim and whether it was or was not a go around miss the point which is that any unplanned activity introduces the first hole in the cheese. Habsheim was a planned activity that had its own set of holes in cheeses as adeptly pointed out by Dozywannabe above and is not a good example.
A better comparison would be Aeroflot 593: allowing two children on the flight deck (first hole), seating one at the controls (second hole), not noticing that they had inadvertently disabled a/p aileron authority (third hole) because there was no audible disconnect unlike Russian a/c (fourth hole) ... you get the point...
C'mon! it was only a fly by! C'mon! it was only a child visiting the cockpit!
Pinkman