That whole article looks and reads like an automatic translation. I’m guessing the original says “Ist der Lilium Jet eine Luftnummer?” Or perhaps “Luftpumpe”. A

That whole article looks and reads like an automatic translation. I’m guessing the original says “Ist der Lilium Jet eine Luftnummer?” Or perhaps “Luftpumpe”. A “Luftnummer”, an “air number”, is “hot air”. A “Luftpumpe” is an air pump but can also mean someone is a BS artist. There’s also a bit of a bad pun hiding in there if it was “Luftnummer”, because “eine Nummer schieben” means to have sex, colloquially. If you really wanted to preserve that … you’d reach for the “blow job”.