I have an email from this time last year that says when I finalized my purchase, I chose Steam Digital Download as my backer reward. Any promise vagueness associated with the campaign before 2018 doesn't matter, because when they finalized my choice it said Steam, that is straight up what I was promised. I had the choice to choose PS4, and if they had said at the time "Epic Games Store or PS4" I would have gone with PS4 physical. As far as I'm aware at this point there's no changing your version of the game you ordered.
As you said, you can repeat a lie as many times as you'd like, but it doesn't become the truth. Now stop trying to lie to people in this thread, thanks.