The September issue of Nintendo Power (#136) revealed that both games had been delayed, and said Sea-Doo Hydrocross would hit store shelves on November 21, a deadline that was missed as well.
In February 2001 IGN had another interview with Vatical and confirmed that Sea-Doo Hydrocross was being tested by Nintendo, and had been delayed till Spring, a deadline that was also missed.
Strangely, this PS1 version was the last game published by Vatical as they seem to have disappeared shortly after ... To my knowledge, a Nintendo 64 prototype copy of Sea-Doo Hydrocross has not been found.
[8] A preview of the game by Nintendo Power in September 2000 noted that "the development team still has a lot of work to do if Sea-Doo is to compare favourably with Wave Race 64".
It noted that "the handling is very tight", but that the game's "arcade aspirations are bogged down by tame courses and even tamer CPU rivals".