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No. It scrapes it 'off' the walls. Then run a patch through to clean up the residue.
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Yes, I can see how it will take care of the cylinder wall part, so mag shells don't stick, but there's still a lot of "real estate" (forcing cone area) in there between the top of a mag casing and end of the cylinder to crud up..... it just seems to me that using a mag casing to scrape doesn't address the rest of the crud that will build up a bit higher.
Having said that, this is my first revolver and before I cleaned it out, it did seem like that the worst cruding from shooting .38 specials, was just in the small area between two shell sizes. Perhaps the force of the bullet naturally scrapes the chamber's forcing cone area so crud never builds up there?