You are of course quite right. The posters in youtube dropped it on me within an hour. I'm just too lazy to do a reshoot
I went over the instructions, and it does show how to seat the TM figure into the cubbyhole, but only to plug in the pistol afterwards like the 'sidecar' gimmick used for the deluxes. So far as I can see, it does not show how to jam it in so as to store inside the chest cavity. So while Hasbro DID design it thusly, they don't seem to have gone out of their way to show it. Luckily some owners are smart enough to suss it out...
Love and hugs,
Death