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@deleted
Yes and no.
Yes, because the splines are shallow, meant to be used on the I/II gen 8sp that were made out of steel (170gr). No because when moving to 9/10/11sp freehub (alloy, 80gr.) Campy made deeper splines (they saw/thought what happens with the alloy Shimano ones), still mantaining compatibility with IIgen. 8sp cassettes. Then whole thing then can be assumed as a temporary thing (as, in fact is).
It certainly works better with "old" style 9/10sp. freehubs, which had more than the actual 4 notches:
But we're going away from our friend's problem :)
He'll be fine with 9sp UD sprockets on any 9/10/11sp freehub, with 8sp spacers