What ever happened to taxi pace being a "brisk walk"?
It's hard to walk 150-200 ft. in less than a couple seconds. Most folks walk @ 3-4 mph. I'd say a "brisk walk" is no more than 5 mph, @ best (every try to use a treadmill and not run @ 5 mph. It's tough). Think about a 10,000 ft runway - it should take you 22 minutes to taxi the length of it @ 5 mph.
I doubt that this AA pilot was anywhere near that speed. Isn't there aircraft data that could be pulled to show his speed? Not that it seems to matter in this case (I wonder what AA's side is). It's pathetic to see this level of micromanagement at any company, but to see it from the current largest airline in the world sets a very poor example for others.