Ardennes has made statements about how they have learned to differentiate between what razor people want and what tool people want. I'd suspect that they are not going to be razor grade unless they have a surplus of clear stones.

As far as belgians go for tools, I've got a friend who was a toolmaker here and responsible for all of the trades at a museum and he could only recall one person using belgians, a carver. I have tried coticules on chisels and planes, and they just aren't as good for that as some other stones that are a whole lot cheaper (most of the synthetics, and the arkansas stones especially).

I'm not sure who is demanding those, or if they're just listing them to test the waters.