It's various shades of spin. For unencrypted videos, T-Mobile might be using other techniques beyond throttling (e.g. downshifting the resolution). Or perhaps he's trying to get around strict throttling by claiming (in his head) that they're only throttling videos, while other data isn't being touched.

I wonder if he's on an internal hunt to find out who confirmed to the EFF that videos were being "throttled".