The article says as much in the opening. It also includes a statement from Microsoft noting they do not intend to carry this forward separately, with a salient comment in one of the Microsoft page citations:

> For functionality and compatibility reasons, Microsoft Edge adopts nearly all of the Chromium project's changes to the web platform. However, Microsoft retains full control of the Microsoft Edge browser and may defer or reject changes.

Removed features don't always follow the same timelines either (and not just because of a lag in syncing to upstream Chromium).