I don't feel like finding a link to a source for you. After 10 years of roasting my own beans from home, I can assure you that the temperature range for brewing is 195-205 as shown in at least one other post and in your link. To do so in a lower temperature impedes the flavor extraction process and provides a poorer cup of coffee no matter the quality of the bean.

To do so is a disservice to the customer. (I also own two restaurants.)