Two and a half years after the last update, and with basically zero releases since, we get this. I was bemused enough to share. Did ANYONE notice? As for why, it's unclear, but the article does say:
... the patch comes only four weeks before the day of reckoning where several of their limited-edition games will be delisted from the Switch eShop. Alongside the removal of these titles, the online features for the Wii U version of Super Mario Maker will be reduced on the same day, permanently disabling the ability for players to upload new levels to the game's online collection.