I can only speak to mine or my TMNT, but.
Same size case as a normal modern comic, nothing new in size just positioned to the right.
At first I thought that too, "oh snap they put it in a magazine case", but no, I wouldn't have even noticed the new inner well...however
I've seen the tab on the back before to "keep a comic" from doing whatever, but what strikes me as odd, is that tab usually lays over the comic or the comic is between the tab and the case.
@CGC Mike that said and being the "case" no pun intended, these positioned alt right seem like if shaken comic syndrome were to happen would slip under the "tab" if there is room in this one causing damage. Unless this tab has no room between it and the case. All very confusing.
Edit added the pic