A "False Flag" attack doesn't mean that no one was injured or killed, it simply means that the bad actor(s) were either set up by government controlled agents or they were government controlled agents.
This guy had no apparent motive and was mired in gambling debt, where did he get all the money for his stash of 27 weapons? How did he pack all of those weapons up to his room? How did this drunken boomer remove a hurricane proof window that weighed in excess of 400 pounds by himself?