Summing up the title ( without yet watching the vid ) for newbys :
A clip is a device which hods ammo , it is inserted into a firearms to load a magazine and then removed , either at the start ( such as an sks strip ect) or at the end ( such as a garand clip ) . A mag is a box that is designed to be inserted into a firearm and fed from till empty and then replaced ( such as nearly all rifle and pistols under common useage ( such as the glock , 1911, ar15, fal , cmte , ect.. ) Its a good thing to know that i can in fact have a " clip " for my mosin or 03 springfield , or my sks . but for my ak , or my ar15 or my mp5 i have mags . Point is for the new folks a rule of thumb says if you remove it and leave ammo in a gun when you reload , then its a clip , if you replace it to reload then its a mag , There are exceptions like the garand rifle , but for now thats enough to get started .
BTW clip nazis are no different than smoke nazis imho . Its nomenclature guys get a grip , if mis quoted its ok .