After that, coming up with an automated process for migrating what must be a shit-ton of zone information to another system must have taken some time. I have no idea what their specific solution was, but I'm fairly confident in the fact that it wasn't just a matter of copying over a few zone files. They'd probably have to do SOME sort of ETL (extraction / translation / load) process that would take some time to develop, test, never mind run.
And I can't remember the last time I gave technical information to a PR person who actually got it 100% technically correct. ;)
My intention wasn't to shit on your point or anything, or in any way defend Go-Daddy and their screwup, I'm just thinking it's a bit unrealistic to try and infer detailed information from a PR release.
In the end, it was technical, they screwed up, and I doubt they'd ever release a proper, detailed post-mortem of what happened.