These ideas may be a stretch but could you-
A- achieve that look from the edible printer? Print on the sheet and wrap around the cake?
B- do the fondant transfer technique and wrap that around the cake?
My only other thought is that they have some special printer, like the one that prints directly on the cookie. Maybe that is how they get it so precise?
Dunno, just some thoughts from my sleep deprived brain...
ETA: doesn't someone make stencils like that? They say it is white chocolate maybe a stencil with colored chocolate or cocoa butter?