I don't know the article, but there are many sources for the individual claims, e.g.:

* Denver is at 5,130–5,690 ft (1,564–1,731 m) [0]

* The boiling point of water at this altitude is between 201 and 203 °F; at sea level it is 212 °F [1]

* "Your brewer should maintain a water temperature between 195 to 205 degrees Fahrenheit for optimal extraction. Colder water will result in flat, under-extracted coffee, while water that is too hot will also cause a loss of quality in the taste of the coffee." [2]

[0]: https://en.wikipedia.org/wiki/Denver

[1]: https://en.wikipedia.org/wiki/High-altitude_cooking#Boiling_...

[2]: http://www.ncausa.org/About-Coffee/How-to-Brew-Coffee

I saw this at Boxcar last time I was in Denver -- a couple articles about their setup:

http://www.freshcup.com/high-altitude-brewing/

http://sprudge.com/in-colorado-delicious-meticulously-brewed...