I've just spoken with the voice in this video and his explanation was:

It's important because if you leave apple loops / acid info checked when you export to DAW, the audio will stretch to match the current tempo or key of the project in your DAW. So assuming that you don't want your audio automatically stretched or pitch shifted, you would leave it unchecked.
There are instances that this won't happen in your DAW, but it's safer to leave it unchecked just in case.


Callie
Marketing Representative
PG Music Inc.