He's repeating what he saw on rightwing websites. Some were claiming that it was a staged, fake shooting in order to give Obama an excuse to grab their guns, others said it was a hoax to get sympathy for Planned Parenthood, and some claimed the shooter was robbing a bank and the cops chased him into the PP facility.
The truth is that the staff was trained to lock the lobby doors and shelter in place at the first sign of trouble, and that's what they did. The gunman never got a chance to kill them.
Of course, that didn't make any difference to FRighties.
They are taking their cue from Trump: Lie, keep lying, and if anyone prove you're lying, insist that you're not lying because other liars agree with your lies.
There are instances of this Trumpian tactic in this thread.