Personally I think this site goes a little too strict on maintaining an exact ambient temp and I still run my sumatran on a temperature gradient in a regular thickness plastic bin in a room that stays around 75F. If I try to move him back downstairs it will be about 70F in the room. Maintaining such a large collection and in racks does seem to tend to lead to preferring slightly different methods and a narrower range of temps but they do cover the changing opinion on ideal temperatures a little and give good examples of the temps to work around.
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I am not sure why the bloodpythons.com site is being so picky about linking to their husbandry section.... Actually it won't link at all but it's under the resources if you type the basic url back into the browser.