They never responded but cnczone.com,but the question was asked and put back on the poster.
I do not know FluidCNC, but what I read is that it is based on GRBL. So if the USB protocol is the same as GRBL, it should work.
I recommend just giving it a try. GrblGru is free !
Wish the poster had said it worked or not!
Looks like jeff and jaime were helping at one time.