Apologies if this has already been covered by people who pay more attention than me, but is anyone else very confused about this scary-looking

Deactivating Infrequently Used Development Accounts

warning? Do I have development accounts? Is that different from a sandbox account? I thought the development account was that old Wolfe Electronics account that you could get years ago (which got deleted a long time ago) I also don’t see any “I want to keep my development account” link under Setup > Company > Company Information…