You can quantittize anything and everything, but a change in the rate of flow of time is not what people would consider numbers. The enemies don't get more HP or higher attack or faster attack speed comparable to your own, everything just happens faster taxing a human player's multi-tasking and strategy given their skill's limited amount of APM.

Another good example would be a fighting game where the difficulty is altered by changing the amount of time between when the AI performs combos. The enemy doesn't get more HP or higher attack or faster attack speed comparable to your own. Sure, you could consider that in built "stagger time" a number too, but everything that would stay the same against a human opponent instead stays the same.