This is it, the moment of truth. Do Nintendo mention it because they feel obligated to tell their shareholders about the new hardware that falls on the upcoming fiscal year (ending March 31, 2025), or do they keep it a secret from the shareholders?
Nintendo mentioned Switch (then referred to as "NX") during (close to end of month) April 2016 shareholder meeting, and that it will be released March 2017.
But of course, one can argue it was a different time back then, the Nintendo fanbase was concerned with Nintendo going 3rd party, entering mobile gaming, etc, so Nintendo might have felt more compelled to volunteer more info during the April 2016 shareholder meeting,, nearly a full year before release, and this time around, with success of Switch, Nintendo might be less inclined to volunteer this information to the shareholders.