I can't argue with that, Scott. Perhaps it's my own bad grammar, but I have never made a distinction between a three pole breaker that had an internal trip mechanism, and one that had three handles tied together.
I agree that either would meet this particular code requirement.
I'm sure that everyone had already been grouping such conductors together, wherever possible. The 'common disconnect' is a new requirement, but not that big of a deal. Where practice gets changed is the requirement to literally tie the hots, as well as the neutral, together in their own bundle.
That's bound to be fun, especially in panels with only one neutral buss.
