Looks like they started with a simple concept which really took off thanks to a chance encounter with someone associated with Oprah. Looking at more of their work on their website, I’m guessing they are actually using a wiresaw or maybe a very fine scrollsaw.
Anyway… how would you approach this on the X-Carve? 1/16" downcut 2F bit?
I would say one of the early problems is the ability to cut deep with such a small bit. Your depth of cut is not going to be near deep enough to cut a cutting boards thickness. Unless you are laminating multiple boards.
I seriously doubt it is a skill saw they are using but overall interesting I think this would be just about impossible with a cnc as said prior the depth of cut on a bit that could do that detail is minimal. I think it is also a pretty weak design who is chopping anything on the word surface…butcher block is already risky being a glue up once words are cut in gets weaker on certain areas as well.