
I agree with PeterAlan's analysis:
"I would not be inclined to overturn the TD's decision. This is not quite the same as to say that if I was ruling ab initio I would necessarily have ruled the same way, but I consider that I need a rather higher standard in order to over-rule an experienced TD's judgment with my own.
Before getting to the bridge judgments, however, there are, as always with these wretched UI cases, the various legalities - a major problem being that there's always something in one law / regulation or another to support whatever point of view one wishes to advance."

It is elementary that once the pure game was sullied with the abomination of alerts, myriad new opportunities were created for cheating. No amount of new regulatory language can anticipate every possibility and block it.
Imo what happened was as follows:
(1) South made the modern equivalent of a slow pass by asking about the 2
♥ bid. He has, imo, a clear 4
♣ call, but he knows his partner is an overbidder, so he passes 'slowly'.
(2) North, having made an aggressive (but not an overbid) 3
♣ call, responds to the slow pass with a 4
♥ overbid.
(3) East, a customer, does not realize the importance of his sixth
♠, and passes.
(4) West, the pro, has no reason to bid.
Par for the hand is 4
♠, either making or down one depending on the location of the
♥ K.
4
♥ makes when 4
♠ is down one or goes down one when 4
♠ makes, assuming 3-2
♥'s
Ditto for 4
♣, except it may occasionally make one more trick than hearts.
Imo, N-S bear watching in the future. My conjectures about them may be wrong, so adjusting the score on this hand might well be an inexcusable injustice.