He's talking about 2 differnt generations of devices.
Xbox One = 1,3 Tflops
Xbox series X = 12,1 Tflops (and newer architecture) , its CPU is like 5-6 times as powerfull as well.
How the hell, does developeing games for the old gen (xbox one) not limit the xbox series x (new gen)?
I call bullcrap, if your designing games from the ground up to run on the old gen hardware, its gonna limit what the game is, on the newer gen too.
its a lie, if so its only because they choose not to fully use the Xbox Series X (which I would call "limiting", or holding back).