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Because you can't shoulder a pistol.
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Sure you can, the ATF even explained that how one holds ones weapon doesn't change its class or nomenclature. Of course, they changed their minds and said you can't shoulder a Sig Brace but that doesn't mean you can't shoulder a pistol AR with a Paracord wrapped buffer tube with a tennis ball on the end (for visibility of course so one doesn't poke their eye out with an unsafe bare pistol buffer tube)! Actually saw this at a range in NC two weeks ago. Ruling pending after some idiot asks the ATF if its OK or not.
Odd how ATF contradicts themselves twice in the same paragraph. You can hold or shoulder an AR15 pistol without a Sig Brace anyway you like and its still an AR15 Pistol. Take the same AR15 pistol holding it anyway you like but mount a vertical grip to the rail and now all of a sudden its an AOW and illegal! Replace the vertical grip with a Magpul angled grip and Voila, its legal again! Take the same AR15 pistol and put a Sig Brace on it and its still an AR15 Pistol, shoulder said Sig Brace AR15 pistol and Voila, its now an illegal SBR! But Mr Agent Man, I am not shouldering the Sig Brace, I just have it really close to my shoulder for proper sight alignment/sight picture, Doh!
This is all just fun reading of recent ATF rulings and is for entertainment, not legal advice.