Google has been wrong before.....I personally wouldn't risk shooting anything heavier than 180 grain bullet in a Radial Delay Blowback considering the propensity to bell cases just above the extractor groove.
At the end of the day, it is STILL a blowback as at no time as it ever locked.
Just my .02 cents.

Honestly not sure......the lack of bell is simple chamber geometry.......CMMG just hasn't figured out how to make it feed without belling the actual chamber.....(If you are reading CMMG I am still available for consulting) RDB is still a blowback and at no time is it EVER Locked.....You can try....but I'd make sure I has come SERIOUS mass buffer wise and inspect the brass closely after a couple of shots.....

I read the article....but it is Marketing......with a capital M. Having built a boat load of 10mm guns in both direct impingement and blowback and made numerous replacement barrels for 10mm RDB, I am simply stating my opinion based on personal experience. If you want to shoot Buffalo Bore 220 hardcast in a blowback gun, have at it......but I know for a fact it'll (Buffalo Bore) come unglued in a blowback upper with a 15.5 ounce bolt and an 11 ounce buffer as I had a customer try after being told not to as a condition for building the upper. Combine that with the wear I have seen on the RDB uppers I have worked on from lower pressure selections ammo wise, I wouldn't do it.