Actually most detergents contain several enzymes for best cleaning results. There is not much difference in what temperature one enzyme can take over another.
It's true that enzymes work between 20 and 60 degrees, but that is only part of the story. The schedule is not contradicting that, it's actually confirming that, but gives more details at what temperature they work best. Remember washing machines having a temperature stop in the main wash at 40 degrees? They stopped heating at that temperature, washed for a while at 40 degrees and then continued heating. It was to optimize the use of enzymes. Actually it is for the same reason heating elements in washing machines and dishwashers became smaller, because with less water usage, the heating phase went too fast. With smaller heating elements they took longer to heat to the set temperature and in that way taking better advantage of the enzyme phase.
BTW,in the link you posted you can see how enzymes play a big part in low temperature washing.
One more thing: The water lying in a dishwasher (actually recirculating) is heated for quite a while to remain the reached temperature for a while (check your electricity meter when the dishwasher is on), so I am afraid enzymes are killed in the cycle when the temperature is achieved or with hot fill dishwashers kept at a high temperature. Ofcourse there is always the option to use a lower temperature in the dishwasher, most detergents claim to perform just as good in a dishwasher at lower temperatures than at 65 degrees or even higher.
It's true that enzymes work between 20 and 60 degrees, but that is only part of the story. The schedule is not contradicting that, it's actually confirming that, but gives more details at what temperature they work best. Remember washing machines having a temperature stop in the main wash at 40 degrees? They stopped heating at that temperature, washed for a while at 40 degrees and then continued heating. It was to optimize the use of enzymes. Actually it is for the same reason heating elements in washing machines and dishwashers became smaller, because with less water usage, the heating phase went too fast. With smaller heating elements they took longer to heat to the set temperature and in that way taking better advantage of the enzyme phase.
BTW,in the link you posted you can see how enzymes play a big part in low temperature washing.
One more thing: The water lying in a dishwasher (actually recirculating) is heated for quite a while to remain the reached temperature for a while (check your electricity meter when the dishwasher is on), so I am afraid enzymes are killed in the cycle when the temperature is achieved or with hot fill dishwashers kept at a high temperature. Ofcourse there is always the option to use a lower temperature in the dishwasher, most detergents claim to perform just as good in a dishwasher at lower temperatures than at 65 degrees or even higher.