They say no moving parts, no noisy propeller, etc. and then show that there is a "propeller generator" [see at 5:20] that all the air is being funneled through

They say no moving parts, no noisy propeller, etc. and then show that there is a "propeller generator" [see at 5:20] that all the air is being funneled through. I am obviously not understanding the intent, so could someone who understands please enlighten me.