Well, one, it's not uncommon for mature males to not want to eat, they've got other things on their mind
Two, while uncommon, some males do undergo a post-ultimate moult. They often die in the moult, but they sometimes live with either missing or damaged pedipalps (can't pull them boxing gloves out properly). Regardless, nothing unusual to see mature males refuse to eat.
Also keep in mind that mature anything may go on a fast before they die. While a female, I had a B. smithi that refused to eat for about nine months before she finally died of old age. Really didn't lose any weight or anything during that period, her metabolism had slowed down so much she didn't have anything more to do but wait for the rest of her body to figure it out on its own.