There was an update on the blog post as of July 18, 2022:
2022-07-18 UPDATE: We are now moving the enforcement date to 2022-10-19. In addition, to ensure impacted users are aware of the upcoming change, email notifications have begun to roll out on 2022-07-18 and in-app notifications will begin in August.
Emails have already begun to roll out, and you’ll start to see in-app notifications in August 