Thats not true and I dont know what it is you read. The only recent thing was that Todd Howard (the director of Bethesda Games Studios, which is just one studio in Bethesda and they DO NOT make Elder Scrolls Online) was that he was on a podcast saying his younger son bothers him about Elder Scrolls VI.
Elder Scrolls VI is NOT in production, and Howard has said that they are waiting for a jump in technology for what they want to do with that game. I doubt it would come to Switch, but who knows.