User blog comment:MisterWoodhouse/Social Activity, the 2010 Editor, and Unpausing Migrations/@comment-26939652-20200922215833

So:
 * Set editor to Source Editor (Not Visual/source mode)
 * Create a new page using "Add" button
 * Et voila, we are in Visual Editor.

Cause Special:CreatePage doesn't respect your settings.

Second, how is 2010 editor without autocompletion a good thing? Did you miss this in the feedback?