You quoted a post that said a med every 2-3 weeks and turned it a medium every two weeks minimum???
A male ball python doesn't need mediums on the regular and if you want to feed larger meals like that then once a month might be appropriate. Otherwise I'd stick to a small every 2-3 weeks which would be better. My male coming up on 20 years old eats smalls about every three weeks and could honestly stand to lose a bit.