Yes, it never existed. Ever. There never was going to be a 4K Switch.
You know why?
"Leakers" and "Journalists" made it up out of an ASSUMPTION.
They saw Nintendo buying up a bunch of OLED screens, and ASSUMED that Nintendo wouldn't be dumb enough to just release a Switch OLED refresh without a spec boost. Ignoring that Nvidia's mobile stuff has been pretty stagnant, these insiders just assumed it would be a more powerful Switch.
But we all fell for it, and we shouldn't have. A huge red flag was NO developers were talking about a Switch boost. We learned about the PS4 Pro from developers, who were talking about the "Neo" devkit at GDC long before the console was announced (and back then GDC was in March). If there really was a Switch Pro, some developer wouldn't leaked it by now.