Interestingly enough you are arguing that breasts evolved to make women more honest - makes it harder for them to lie about their age.
The author argued that breasts allowed the women to be less honest - removed indication of infertility.
But in either case, the rest of the argument of how men evolved to like breasts could still be true.
All this really tells us is that the range of possibilities are large. I think the question of how one could prove, or at least narrow down the possibilities is an interesting one.
For example, if one could demonstrate that our ancestors had an aversion to breasts, and that the change to liking them was in a reasonable probability of occurring in the way the author describes, then his explanation is reasonable.
But, given the random nature of evolution, finding the precise answer may not be possible and the best we can hope for is a set of weighted possible explanations.
But in either case, the rest of the argument of how men evolved to like breasts could still be true.
All this really tells us is that the range of possibilities are large. I think the question of how one could prove, or at least narrow down the possibilities is an interesting one.
For example, if one could demonstrate that our ancestors had an aversion to breasts, and that the change to liking them was in a reasonable probability of occurring in the way the author describes, then his explanation is reasonable.
But, given the random nature of evolution, finding the precise answer may not be possible and the best we can hope for is a set of weighted possible explanations.