They're dual purpose I thought? They were comparing them to solely meat birds like Cornish, Cornish Xs, and like rainbow rangers, etc. I think. NHR can be used for meat and probably often are but they're not "meat birds" I think is what they mean, especially when the meaties it's usually 8-12...
Gorgeous birds! I, like others, hadn't realized they'd been around so long! I guess I knew they were a breed, bred for production, but I had thought they were a relatively new breed. 1935! Wow!