My interpretation is Matthew Mitchell is not real the entire time, a manifestation of all the anxieties and skeletons from Eminem's past. In that sense, "Matthew Mitchell" still is rapping in the final verse.
Quote:
I’m the future that’s here to show you what happens tomorrow
If you don’t stop after they call you the
Biggest laughing stock of rap who can’t call it quits
When it’s time to walk away, I’m every guilt trip
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