Yeah, I can’t play it either, RC.
Your recording might work, but it’ll be easier on the mixing guy if you download the backing track from here:
There’s a sync tone at the beginning that they’re using to make sure all the tracks are synced. Scroll up to the #2 post in this thread for step by step instructions posted by Mike_R.
I think Mike was the only other guitar picker, so another guitar part should work out fine. Also, when you go to share the file from GarageBand, uncheck the box to send compressed. That will export your recording as an AIF file. It’s a lossless format and will yield better quality.