I don’t know if it is a hoax, but I believe the letter is wrong.
Each of the weapons can be purchased with no problems. It’s not an ‘aresenal’. It’s not like he had full auto uzi’s. He had a remington 870 which I can buy today. An AR-15, which I have. And a Glock 40, which is also easy to find and get. He got ammo for them. Easy. I can go to walmart and get ammo at any time.
The bomb stuff, IDK, but I believe you could probably find stuff on the internet. I haven’t looked for it, but I would assume.
It wasn’t sophisicated. It’s not like he repeled into the theater and then disapeared in a cloud of smoke. The guy faked a phone call. Walked out. propped the door. Went to his car. Got his stuff and came back. Finished. Walked back out to his car and got arrested.
I don’t doubt that a trained Marine would conclude that an operation as described by the media would be difficult to pull off by an individual, even a trained one. One aspect that bothered me was the tear gas canisters he allegedly tossed in. It’s not an item that civilians can typically get off the shelf, unless he made it himself.