It's like people have completely forgotten that fact. That snippet was at the very end of a 30 minute Bethesda presentation that had Fallout 76 with its multiplayer being a significant move away from their traditional formula, Elder Scrolls Blades (which is a mobile game nobody remembers) and the reveal of Starfield, a completely new franchise. Of course fans are going to question where is TES 6.
And a few months later Blizzard showed what happens when you don't tease Diablo 4 after revealing Diablo immortal.