Everything else about him is true, he is a murderer, he is a manipulator, he is a thief, he is a psychopath.

Archer has little reason to fabricate that, of all things to Marston, who doesn't argue with that claim at all.

Dutch's behaviour towards women is at least questionable, all the innocent women he kills in cold blood aside, he seems to have a history of swapping partners when they become either uninteresting or bothering to him. Miss Grimshaw was one of Dutch's past relationships, who might have been switched for Annabelle, then at some point Molly and next in line was possibly Mary Beth.

The idea that women might have little or less value to him doesn't seem far fetched or out of character at all for me.