STM32 processors have traditionally been M-series 32-bit ARM cores including M7. I don't know if there have been any exceptions before this. But A-series is application processors with MMU's, DRAM interfaces, etc.

STM8 is still a thing and they were popular cheap embedded boards before ESP32 took over. They were ok as a cheap alternative to Arduino-compatible AVR boards. I have a few of the boards around. They were around $1 each on Aliexpress and have 8K of flash and 1K of ram, which is enough to run interactive Forth, and there's an SDCC compiler target for them.

The MP1 is 7.5 years old now.

That's the thing, STM32s are jellybean devices that you can tenth-source from anywhere, including some guy cooking them up in his kitchen in Shenzhen. This thing is an STM32 in name only (SINO? STINO?).