That sort of advice is shocking, inept and utter rubbish.
I think it depends on the aircraft, most light types that cruise around 100-120 you can come in at 90 with perhaps just flaps one and accept the float which is likely going to be down a rather long runway. Or if one becomes visual early add more flaps and slow some more. Most of the time its not advantageous to land on the numbers on a 1.5km+ runway anyway since all it means is that one has to taxi longer to the first exit.
Anything that cruises faster will obvious need slowing down more, if your in a SR22 your not going to want to come in c.150kts obviously...