This is one of those situations where it's pretty much one of two outcomes. Either Nintendo reveals some new Switch hardware and the privating of the other Switch model reveals was to avoid YouTube search confusion when looking for the video of the new hardware (as Nintendo did already do this once before when they privated the Switch Lite reveal before unveiling the Switch OLED model), or it means absolutely nothing and is just a case of whomever is in charge on Nintendo's YouTube page making a mistake.
If new hardware is about to happen I'll keep my expectations LOW and just assume it's going to be a reveal for a Lite version of the OLED model, so now all Switch systems going forward are versions with OLED screens. Even so you know damn well that one small part of my brain is hoping maybe we're gonna get a "Pro" model reveal that'll do things like add 60 FPS support to games like Breath of the Wild. All we can do right now is wait and see, as with the exception of the reveal for the Switch itself back in 2016 Nintendo doesn't really tease new hardware reveals on social media, they just drop it all of a sudden without warning.