My guess is that someone jumped the gun on NRND-ing STM8.
Supposedly, the STM32C series is the successor to the STM8. I hear that (at least some) are pin-compatible with the STM8's. However, they're NOT 5V MCU's, which means you can't just port the firmware and drop one into all existing designs. Also, they don't yet seem to be as widely available or as inexpensive as they're hyped to be.
The STM8 really found its market in China, in the 'cheap gadget' segment, powering thermostats, timers, PID controllers, soldering irons, etc. I suspect that that market is now dead to Western chips, given the current geopolitics, not to mention the plethora of μber-cheap 5V pin-compatible asian 8051/M0/RV MCUs. By killing STM8, they're just accelerating the move to non-STM alternatives.