I think you're confusing last year's eShop closure with this news.
All online 3DS and Wii U games except for Pokémon Bank are shutting down, be they physical or digital.
The eShop already shut down in March 2023.
Yes, you can still redownload games.
This is online play that's ending for 3DS and Wii U games on April 8th.
Nintendo has announced that online play for the Wii U and 3DS will end in early April 2024.
https://www.nintendolife.com/news/2023/10/3ds-and-wii-u-online-play-ends-in-early-april-2024
Pokémon Bank will not be affected.
What are your thoughts on this news?
End of an era for free Nintendo...