Microsoft are looking at putting datacenters under the ocean

Um, no they’re not. That article you linked is from 2018, and the experiment concluded in 2020. They pulled the data center out, and concluded that whilst the experiment was successful, several challenges still remain (such as around repairs and maintenance, physical security and energy supply reliability), so they haven’t toyed around with the idea since then.

Basically, Microsoft have no plans at all currently to put data centers under the ocean - unless you’ve got some insider knowledge.