They made this comment in a video blog regarding the XL, which is using an STM32, several variants of which have been in extremely short supply. I'd presume th

They made this comment in a video blog regarding the XL, which is using an STM32, several variants of which have been in extremely short supply. I'd presume that might be the specific part they were talking about. Also, they have been using 32bit controllers for all new FDM printers since the release of the Prusa Mini in 2019. That now includes the XL and the Mk4.