Surprise! Beating Kranion's Secret Weapon unlocks the 2006 Super Freaks in all of their poorly drawn glory. You also get Secret Run, which is all of the secret levels minus Exciting Encore, all of which are altered layouts from the 2006 and 2016 versions of the game. With these two things combined, you can technically play an abridged and heavily upgraded original Super Freaks 1.
At this time, Mr. Freaks has 3,956 views for Super Mario Maker 2 spread across 67 videos. About 6 hours worth of Super Mario Maker 2 videos were uploaded to his channel, or 9.52% of the total watchable video on Mr. Freaks's YouTube channel.
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