I agree that the explanation is inadequate, and that EW should be reprimanded for failing to disclose their agreements. I did come across one or two novices in the Seniors Pairs, but most of them have been playing tournament bridge for decades and I expect NS were experienced enough to ask further questions if they needed to know more.
My inclination would be to allow the score to stand, but the actual ruling was to adjust to a mixture of 4
♠(N) making and some other scores. I couldn't see much justification for this, but it's possible the TD giving the ruling had more information than I am able to give.
1eyedjack, on 2013-September-16, 23:26, said:
I think that the construction of the description was calculated to deceive and E/W should be spanked for it. Adjust, and maybe they will learn.
If you think EW need a lesson you should fine them. Score adjustments should be given where an infraction has caused damage, and I don't think it has here.