Sounds like rubbish to me. You can hold a much higher speed down final in a turbo prop than a jet because you can slow down very quickly.
Same impression here, utter cr...p. A KingAir can hold 250 KIAS to 5-6 nm and land at Vref. Try that in a 737 or 320. The guy is probably a spotter or a SLF. Or a FSX skipper...