Yahoo email migration optional

On Reddit there is post that says the migration to Yahoo email service is now optional.

https://www.reddit.com/r/Comcast_Xfinity/comments/1qgk7ud/comment/o0cyvf4/?utm_source=embedv2&utm_medium=comment_embed&utm_content=action_bar

Is this true?

If so, how does one accept this option?