Again, I don't understand this mentality.
I think its unlikely it was just made up and snowballed, OLED doesn't equate to better specs and the rumours were actually quite specific and lots of reputable sources touched on it. Eurogamer had their own sources which makes me imagine it was something happening/being prototyped behind the scenes but plans changed. At one point MS was playing with giving Xbox One X a new CPU but it was too expensive.
I agree though, its on us if we believe rumours will be 100% accurate. Even if they are true at the time of reporting it doesn't mean the company isn't floating various options at that point or that the info isn't outdated.