Hmm.. I actually read that in a thread here some time ago but I assumed it just didn't want to eat.Yeah looks like a MM to me. They're generally great eaters and don't refuse food unless they're in premolt, and he looks quite skinny to be premolt. I'd say enjoy the time you have left with him and be happy you didn't pay full price for an adult female.
You can generally tell if it's a MM because there will be bulbs at the ends of his pedipalps and he will have "hooked out," meaning he has tibial hooks on his front legs. I don't see hooks but he's not really at the right angle for it.