A whole lot of staff time went into writing that one, and perhaps they get promoted based on the number of words they use. That said, it looks like they are saying "play it safe out there, when in doubt, deice".
Just may save an aircraft or two from crashing on takeoff. Have you ever seen the video of the 4" of snow blowing off the wing of a 'bus on takeoff....
- Happy that I'm in Turks this month!!
FR