It operates by using a high voltage to strip electrons from nitrogen atoms, then the opposite current to attract those ions to the front surface of a wing. The movement of the ions causes the air to move, which generates lift over the wing.

So no, there's no moving parts involved in generating the lift.

I think GP was making a joke that the ions are the moving part.

I've been seeing 'GP' 'round these parts for a while now. What does it stand for? Grandparent?

I've been assuming it means "general poster" (in contrast to OP which means "original poster"). Could also be "grandparent" (in the context of the comment hierarchy of "parent"). In any case, regardless of the specific abbreviation intended, the meaning is pretty clear from context.

GP (noun): the author of a previous comment which is the topic of the current comment. "the GP wasn't sure about the terminology until IIAOPSW came in and cleared it up."