Throughout its "objectives and scope" subpart Q does not identify that the avoidance of fatigue is its purpose, and the employer or operator is not required to produce a roster that takes account of fatigue. The only person or persons who are responsible for fatigue in the whole of Subpart Q are identified in paragraph 4 headed "Crew Member’s responsibilities".
I think that you may have overlooked paragraph 3 which deals with operators responsibilities and in particular 3.6 which states "Operators shall ensure flight duty periods are planned to enable crew members to remain sufficiently free from fatigue so they can operate to a satisfactory level of efficiency and safety under all circumstances."