It is a hypothesis since it's obviously incomplete. You were shown one theoretical example (the 0.5Ω - 1Ω thingy) and one experimental (which if you don't believe me then it's dead easy and cheap to verify).No hypothesis. Its Physics 101.
For another example you can go over to steamengine, dial in those coils I tested and look at the recommended power... (assuming that there's any degree of usefulness to their recommendations
The theoretical example alone though is enough to put "lower resistance always needs more power" back in its place on the drawing board. Nevertheless I recommend the experiment, I found the result surprising, not at all what I had thought it would be.