More info has come out. He was a technology nut who thought AT&T was using 5G to spy on him - typical paranoid schizophrenic.
As a technology guy with lots of money, he could make as powerful a bomb as he wanted with a little research.
The statements that he was some kind of computer genius were exaggerated to get more views. One small businessman said that he fixed Internet issues for his business once in a while.
But— he could not get it into the building, nor could any he might make do the internal danger blowing out of the building.
Just an opinion— but a perfect... perfect Leftist set up to cover what is clearly a deep state act to cover their tracks. There are experts in regards to this facility and much else, and they will tell you this.
The houses were left to him by family members. He was probably mainly unemployed for a long time.