Actually, this really never surprised me at all. The purpose of the general staff was to prepare for war. If they didn‘t have a strategic plan to invade Canada they would have been derelict in doing their jobs.
The use of "colour" plans were used pre-1914 and resurrected in the interwar period. The war plans covered certain hypothetica scenarios, in which a colur was the code name for the strategic plan to be used if America were attacked by a particular nation, for example, red for Britain (Crimson for Canada?), green for Mexico, black for Germany, and orange for Japan. The plans were limited in scope, with only superficila attendtion to logistical aspects and with no provisions for coalitions or for conditions of total or global warfare. They were unrealistic about contemporary or future international alignments... (Makers of Modern Strategy, p 710).
As far as a Major authoring a document, I don‘t think it was that wrong for the times (particularly based on the comments above). Its a sad state that Majors of today are merely coffee boys in NDHQ and the Pentagon. Independent responsibility has been lost to the mediocracy of numberous committees...