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There are links to all the standards work in the article. All of the APIs mentioned are going through the standards process.

At the W3C TPAC 2018 meeting, the spec editors for the IndexedDB spec agreed that after incubation (in the WICG, which is another less-formal standards group), KV storage should "graduate" by being incorporated into the W3C IndexedDB spec itself. (Indeed, they were enthusiastic about the possibility.)

This is a Javascript module, not a web standard. It goes through TC39

Not quite! Like built-in globals, built-in modules are a shared workspace between all standards bodies. In this case, KV storage is a web standard, for a built-in module that will be a web feature. This is similar to how IndexedDB is a web standard for a built-in global.

This is from TC39, the committee of ECMA that publishes Javascript standards.