Wilbur Hubbard wrote:

Among other things, they claim to be able to create something from
nothing. The advert states, "Even in dead air the apparent wind when
motorsailing generates lift and reduces the amount of engine power
needed to maintain the same speed the engine would produce on its own."
Huh? Tell me I ain't dreaming . . .

You're not dreaming, they're right and you don't understand physics.

Is there any more help that you need?