No-Coverage Answer
The Taygetan contact material does not address the claim that the Andromedans salted Earth's oceans, nor does it reference this specific piece of Alex Collier's testimony. Swaruu endorses Collier generally — "The human representative who has had most contact with the Andromedans is Mr. Alex Collier. I recommend to study his works, as they relay the truth" (128) — but no transcript examines his specific claims about ocean salination.
Alex Collier is mentioned elsewhere in the context of nuclear weapons semantics: Yazhi notes that both Rashell (Taygetan) and Collier's Andromedans used imprecise language when warning about nuclear weapons, when they should have specified "energy weapons referred to on Earth as nuclear" (310). This demonstrates that the Taygetan team cross-references Collier's material but does not indicate they have examined the oceans claim.
See also: How do the Taygetans feel about the Andromedans and their role in the Federation? and Are the Andromedans from the Andromeda galaxy or from constellation stars within our galaxy? (for Andromedan profile and Taygetan perspective)
Searched: All 834+ transcripts (grep for "salt," "ocean," "Collier"). No results connecting these terms in a salted-oceans context.