It doesnt run klipper/marlin, its a custom 'elegoo os' as its a combined single board from what I've seen of the electronics bay. It should be trivial to drop a driver board and rpi in it though and run klipper, I plan to do this when mine arrives (july :/) I have many vorons, and wanted something in the 250^3 range to go between my v0's and v2.4 350^3, and klipper & mobileraker is a must for my managment.
I'll post if I remember when I've done this if no one else has by then, I'm sure it's just a matter of time though. I have plenty of controllers and pi's on hand to drop in when it does finally arrive.