Not sure this is a debate. Seems like you might not fully realize you still own the rights to work published in most (all?) Medium publications? You don't need to "move" an older story. You can reprint it elsewhere while leaving it up in its original home on Medium. However, if you're planning to place the story somewhere that demands exclusivity, then, sure, take it down from its old home. (This would be the case, for example, if you were going to put the stories together as a KU book, since the Amazon KU program demands exclusivity.) Seven months of inactivity is way too long.