Mac Mini M1 dual monitors 2k at 144hz?

That might work on a 2018 Mac Mini or Mac Studio using 2 USB-C to DisplayPort cables. Problem is that an M1 Mac Mini only supports 1 display from a USB-C post and 1 display from the HDMI port at 60Hz.

Connect a display to Mac mini - Apple Support

Officially not. You can’t go beyond 60Hz.

Maybe, good luck 😉

monitor that run at 144Hz likely also support other refresh rates so it could just have defaulted to 60Hz

This is Apple’s user to users forum and we have no idea what the next Mac Mini will offer for a chip or display support.