The reason I'm posing this broadly is that there are a broad range of evolutionary psychology, incel, and PUA beliefs that subscribe to the view that a stronger partner is one that is deterministically more attractive to women. This paper doesn't support those views.

I can't think of many other reasons why this article would be upvoted. It focuses on a vanishingly small population of a certain age range in one part of the world. The conclusion I'm coming up with is that men born between 1923 and 1948 in Tromso, Norway who are married are more likely to have a higher grip strength than unmarried men.