The "two pilots was unheard of at the time..." has always been GR BS. BOTH "Gilligan's Island" and "Lost In Space" got second pilot attempts before they finally aired.
Incorrect examples.
Neither is the same as shooting two wholly different pilots.
Also, it wasn't just Roddenberry saying it. This was backed up by Herb Solow. There's also a difference between a series pilot and a "broadcast" pilot. So, no Roddenberry BS there.