this is basically the point exactly, when it comes to women's attraction to a man there just are generally more things involved (in contrast to men where there is generally a simple formula for attraction, thus some mistakenly attribute this to women), and of those things being all musclely just isn't near the top for most women. which isn't saying women aren't swayed by a dude being brolic, it just ain't the easy pass like it potentially is for women
sure, indirectly it can be a differentiator in that one's presence literally stands out more which can lead to compliments that give the open to conversation & display of charm/game/personality that skips the having to initiate but it isn't the wave most guys seem to think it is. upon inspection i think most guys would find that it's very much a case of diminishing returns and if anything a slight hindrance in the general population of women (of course there are subsets where it is a marked bonus or even a requirement)
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...i would not discourage any bro from chasing getting in better shape or even that swole aesthetic but i would tell any bro that is doing so in the explicit pursuit of being attractive to women that there are better/more direct ways to achieve that if that's the primary motivation
observationally i've noticed that this is the time in gym cycle where attendance is ramping up to peak...definitely not hitting the gym the day after these holidays