I am not an expert but I don't think this is true. I think that would make for a very narrow definition of power, and by extension superpower. Intuitively power stems from all sorts of leverage. Could be knowledge based, economic, any number of factors. One term that is often bandied about is so-called soft power, cultural factors and what have you.

I say thank goodness military might is not the only measure of power or we'd be in a sad state of affairs when you come to think of it. That's not to undersell the force projection of military might, and does not deny that the US (and Russia to a lesser extent) derive enjoy an outsized place on the world stage owing to military might.

Put it another way. You may be right but I do not want you to be right. I don't want to live in that world.