Could well be. A lot of it is just marketing.It might have been Mt. Healthy. They just don't have them listed now.
I mentioned McMurray because they specifically say that their "Cornish Game Hens" ARE Cornish Cross, and I was guessing that "Cornish Game Hens" from other hatcheries might also be Cornish Cross.
Your description sure sounded like Cornish Cross body type and behavior.