I don't think that's what this is.
From a cursory glance it appears to be a physical guitar pedal that lets you program virtual effects. The "vibe coding" aspect is likely a system directive + effects library SDK docs fed into an LLM along with the user prompt that generates the appropriate C++ which is then compiled into an effect and run on the pedal.
Note: Which is still very cool. The previous programmable guitar pedals that I've seen were all pretty low-level.
Ive been interested in doing this with a raspberry pi. Ive plugged my guitar to my pc and used FL Studio, a daw, and can add effects to it live and was curious if someone would code a os (i guess) that only ran VST (the filters) and had a screen and knobs to control things. I know its very possible, I just didnt have the time to learn how to do it.