You made an assertion. If you are unable to provide supporting evidence, we can assume that your assertion is incorrect without needing to prove anything.

Advertising for a product isn’t a citation. That article literally just repeats Dyson’s own claims. Do you have anything that actually tests that claim?

You made a claim first, so you should provide your citation first as well.

They do not. For a given power input they produce less airflow at lower velocity than a regular fan. They’re a complete scam.