That was probably a wise move, gun community is under a lot of pressure right now. You don't need to be giving out info. like that.
If you read Timothy Mullin's old series, testing the War Weapons, he was a great proponent of the super hi-RPM full-auto .22's as a house clearing tool. He argued that with a 100rd mag, they offered better stopping authority than a 12 gauge with buck shot, as because of low recoil, in a small space you could deliver 15-20 rounds of rifled .22 on a target, in a single short burst, the dynamics of which were more powerful than the individual smoothbore shot loads of two blasts from a shotgun firing 00 buck, he chronographed and tested scientifically and it made interesting reading.
He made quite an argument, and that video made me think of his writing.
Me personally, I have no use for a full-auto .22.
Although I know Swanson has come up with a reliable blank firing version of the STG44 .22, using long nose .22lr blanks, but for film work, it would be a bit diminutive in muzzle flash and rattle. It's on line, on youtube I believe.