It seems like there are a dozen more boards from the same manufacturer as that pretty STM32 board with the empty pads for EEPROM/FLASH/SD Card slot. This is one that I found interesting, and there's also another one with a big TFT display with a flat cable. I'd guess they're actually made for the chinese market, probably for the people programming fridges and microwave ovens, and only a few oddballs manage to sneak into the west via Aliexpress/Banggood listings
They're only on Taobao. I asked a seller on Aliexpress if he could get this board.
EDIT: I found this one on Aliexpress:
https://pt.aliexpress.com/item/Placa-de ... 91033.html
Also this one, which is smaller and comes with a LCD:
https://pt.aliexpress.com/item/STM32F40 ... 64284.html