It's not what you think it is ! This is not the point !
As the Russians found out this technology is just not practical.
1) You need water as flat as a mill pond.
2) Engines don't much like having several tons of salt water thrown at them at high speed.
3) In the event of an in-flight contact with the surface it would be every rivet and panel for itself.
4) A mass that size cannot respond quickly enough to say, a rolling swell or chop.
5) Turning is a problem as banking over is to be avoided !
Now a few technical notes;
Ground Effect is generally considered to begin within 1.5 wingspans of the surface depending on wing shape. Delta wings have an astronomical GE.
Aircraft do not encounter "crosswinds," it is the ground that has crosswinds. Aircraft move in a straight line relative to the airmass. This is excepting inertia effects though.
Regarding licencing, you do not need a licence to fly per se, no matter what the height. You need a licence to operate specified aircraft.
I'm afraid though that this whole subject is boswelox. The point has been totally missed. They won't be setting up production of these things.
The Chinese are an emerging industrialised nation. They are flexing their technical wings. This is a repeating pattern with them. They are proving to the world and themselves that they can match other countries' acheivements. In the future expect to see a supersonic passenger plane and other milestones.