It is not possible to purchase the digital Nintendo Switch 2 Deluxe Edition directly from the Nintendo eShop. Please purchase the Nintendo Switch Deluxe Edition first and then download the free upgrade pack.
Deluxe Edition (Nintendo Switch Software)
Nintendo Switch 2 Edition Upgrade Pack (Free)
https://www.nintendo.com/en-gb/Games/Nintendo-Switch-2-Edition/FINAL-FANTASY-TACTICS-The-Ivalice-Chronicles-Nintendo-Switch-2-Edition-2881480.htm