This is not correct. It is about all dishwashers, but professional ones seem to lack a cleansing cycle after rinse aid is applied, thus the concentration of resulting rinse aid is higher. A consumer dishwasher is also used in their tests, but the concentration was much less than the professional dishwasher - however, they tested with 20g of rinse aid and used assumptions of the number and volume of washing cycles from their test dishwasher. A deviation of 10% difference in since water could increase the concentration significantly, by a factor of ~2 or more depending on the final rinsing stage.

So, in their example, the results in consumer dishwashers fell in the 1:40,000 - 1:80,000 dilution range. But, that does not necessarily apply to a different brand of dishwasher with a different method of rinsing. A 10% savings in the rinse cycle water might move that ratio into the 1:20,000 - 1:40,000 range (which is within the range of having an significant effect). So, I interpret this as not dismissing of consumer dishwashers, but rather indicating more careful study is needed.