The belt isn't an abstraction of the structures in a modern OoO CPU corresponding to registers and renaming but rather the bypass network further down the pipel

The belt isn't an abstraction of the structures in a modern OoO CPU corresponding to registers and renaming but rather the bypass network further down the pipeline. The belt like the bypass network only has to store data for limited periods and the translation is much simpler than what an OoO CPU has to do when renaming registers.