Then why do we have whole threads on this!?!: https://www.wowhead.com/news/new-old-god-whispers-in-nyalotha-nzoths-special-voice-lines-330479
Players are still paying attention to N’Zoth(despite your and others’ personal disappointment in not getting an Underwater Expansion) and his latest Whispers clearly refer to the Waters of the Halls of Infusion.
The only method the Waters would be corrupted would be if the Aspects were tricked into letting a Void-corrupted Entity taint them and the statement of “She is not the last, but the first. Drown her and you will see.” from the Uu’nat Raid is the closest match.