Wavelength in kHz?
Apart from that particular bit of nonsense, they're mentioning 75kHz for FM *and* AM. That'd be even lower than the DCF77 signal. Even if they'd mean 75MHz (with DAB transmission frequencies being 200..230MHz that might make a little more sense) that frequency has no relation to either FM (88-108MHz, 10.7MHz IF) or AM (150kHz to 30MHz or so, 455kHz IF) broadcasts.
Though it's wholly in line with the "technical expertise" I got to experience at Halfords.