What I am saying here is that these so-called "pistols", which are actually carbines, violate the spirit of the National Firearms Act WITHOUT violating its letter.
Well if that is what you want, be sure to support your local Communists; your corner of the State is full of them. If no one wanted to get around laws or regulations, we wouldn't need lawyers, would we?
As for 'violating the spirit of the NFA', products and processes are developed to skirt .gov regulations (because that's what the NFA is, not statutes) of all types every day. Lawn Mowers. Building thermostats. Ad nauseum. Why are you so hot under the collar about this particular one?
Reframed, it can be thought of this way- If braced AR's are not regulated, why should SBR AR's be, since they are very similar? Does a $200 tax paid make an SBR that much safer, or more effective? (or less?)
If the Powers That Be thought they could sweep everything similar into the NFA, or just outright ban it, they would have done so by now. Bear in mind the the NFA originally included handguns-all handguns. Not just semi-autos. That didn't fly because too many Congressmen and friends ($$) of Congressmen in 1934 owned pistols and wanted to keep owning them. So they picked on the 'exotic'- SBR's, SBS's MG's, things that few people owned, and contrary to popular thought, the criminals that did use them more often got them from raiding NG and AR Armories than buying them at Hardware Hank.
I'll close with a paraphrase of a quote, and an actual quote;
First they came for the machine guns, and I did not speak out—
Because I did not own a machine gun.
Then they came for the "Saturday Night Specials, and I did not speak out—
Because I did not own a "Saturday Night Special" .
Then they came for the AR style rifles, and I did not speak out-
Because I did not own an AR style rifle.
Then they came for my single shot .22—and there was no one left to speak for me.
Paraphrased from Martin Niemöller
And one from a Founding Father;
We must, indeed, all hang together or, most assuredly, we shall all hang separately.
Benjamin Franklin.
Some gun owners are their own worst enemies, and they hide it, even from themselves, in false moral superiority.