It is all marketing hype. That is why the NEC recently made a change to allow using the nameplate amps instead of HP when dealing with these overblown claims.

By the way, the HP claims are likely to be true, the motor in question will develop 4hp, just before it lets all of it's smoke out, for sure it is not useable HP.

Tom

Few things are harder to put up with than the annoyance of a good example.