I believe this law was mainly introduced to allow retailers to import the EU style bikes, which were illegal under the old definition of an ebike in Oz. This is a good move, as Australian bike shops were stuck only being able to sell chinese quality ebikes. Now they will be able to import and sell a huge range of higher quality bikes already available in europe. Unfortunately they are restricted to 25kph/250w.
I agree the regulations are poorly written, as I discussed earlier in this thread here: viewtopic.php?f=3&t=16520&p=589074&hilit=60034#p589074
Here is a copy of the 60034 standard:
But it doesn't help clarify things much, as it was written around putting a rating plate on a generic motors to give the end user confidence that it can handle a certain power load without melting. But now EN15194 is trying to use it to refer to the power potential of the motor on an ebike, which is just wrong.
On ES we usually look at the battery input side peak power, where as the 250w is supposed to be referring to the continuous output power. So once you factor in efficiencies, peak vs continuous, and actual power to the road, the "250w" bikes are probably closer to what people on ES would consider 500w.
I just wish they had also adopted the s-pedelec definition for use in Oz as well, which allows assistance upto 45kph, albiet requiring registration and insurance.