There will not be more content updates for "Kirby: Star Allies" on the switch. This stops support in that sense.
Today, "Switch: Star Allies" on Switch released a fresh update, adding three more friends (Magolor, Taranza and Susie) and a new way. But that is with new content. Unfortunately, it will not come anymore.
As director Shinya Kumazaki (from the HAL lab developer) confirmed, "Kirby: Star Allies" will no longer receive new content. Kirby's friends list is over. If errors occur, they will of course be fixed through the update.