Someone was helping him.
Seems unlikely that this basket case would be able to build his bomb and detonator (without looking on the web), recon the site, and roll up with an AR and a freaking ladder and get in position all by his lonesome.
But not buying the Iranian connection, myself.
This is misdirection. Iran doesn’t want the US to shift all of its resources going to the Ukraine to Iran’s own borders. And then send a bunch of moabs to Tehran.