Described as low speed high lift, that's all I can really find out.

I figured that warning was just to cover their asses! Thanks Colas, I think I'll look for something more suitable. I do want to kite foil too, but mainly would want to SUP foil. Thank you.

In all honesty, it may be also to cover their corporate ass. But since they also make SUP foils, there must be some truth behind this warning. It may be related to the resistance of aluminum in breaking waves (carbon will flex and recover its shape, aluminum will stay bended), or the sharpness of the wing, or... I am very cautious, but I couldn't avoid from time to time some uncontrolled situations while getting out of the water with some small shorebreak... a tough stress test of your gear reliability.

All the feedback I have read is that you can kitefoil quite well with a SUP foil, in recreational/casual mode (not seeking ultimate performance) but the opposite is not true.

Piros said..
There are plenty of Sup foils out there with Ali mast

Of course! It all depends of the thickness and the quality of the Ali. (same for carbon or any other material)
If they made the warning, it may indicate something.

Colas said :- People were kitefoiling with kitefoils below 6 knots before SUP foils even existed...

Bugger me mate that's amazing but us Aussies were getting kites up in 3 knots with Vegemite rubbed all over them.