After watching your video this was the main point of contention regarding the falcon gun special effect shot. I know you got that info from a wikipedia page that I feel is incorrect info and I don’t blame you for taking that statement at face value.
The link above describes the shoot out where Greedo comes to collect Jabbas money and they both get caught up with the stormtroopers. Greedo dies and Han escapes.
I could see George thinking about changing when the Greedo scene happened and how it happened and getting something alternate, but I’m pretty sure that if this was filmed that it was never in any cut.
What you see in the finished film “is” this scene with the greedo / Rhodian character edited out.