I saw this printer mentioned on a facebook forum & seems like this method having the build plate stationary is a better idea than having the build plate moving at all which is what the delta printers do also. Not sure if this is a decent printer or not, but I liked the idea. Are there other core xy printers using this movement method? Seems like all the ones I see have the build plate moving up & down.
Here is another corexy I found with a fixed build plate.
And this page answers my question as to why you don’t see this much.