Delays can be compensated for during either recording or playback, the problem is when both at the same time. It just so happens that recording is typically done "in-the-loop" with the backing track being played through headphones during the session.

I'm guessing they mean the monitoring latency while recording. For me, that's one of the most vital parts of a recording environment. If I hit the key or the drum and hear it come through the headphones 50ms later, it's completely unuseable.