As others have alluded to, it likely would heavily depend how such a definition of “broadband Internet" gets used…

As a recommendation, it’s a wonderful thing to have a reference target for service providers to aim for in their offerings. 

As a mandated requirement (e.g. when used for purposes of approving government licensing or funding), then it’s very important to recognize that there will always be unintended consequences of such mandates; i.e. it’s very easy to argue that “everyone deserves N times faster Internet”, but implementation reality is always that funding doesn’t exist to provide that service to everyone, so such mandates can result in those who would very much appreciate an “inferior” government-approved or subsidized service getting no service at all…

The above is not a statement in favor or against any particular definition, but rather observation that the question is hard to consider absent more detail about circumstances (and some of the potential consequences) of how the definition will be applied back in the real-world.