Sure man, no problem.
If after ordering the GCMS note, an applicant observed any of this information in the visa officer's assessment - Review Required (RR), Recommended passed (RP), Recommended Interview (RI), then it is highly likely that the visa officer has concerns about the credibility of the application and may likely refuse the application.
However, if it says something like
declared the ELIGIBILITY as PASSED, with this information on file, they are 99.9% sure of getting an approval.
In this scenario, the applicant can go ahead and begin classes online. Even if the visa officer requests a deferral, the applicant can send it by webform and once inside Canada they can later request and submit an application for a visa extension since the course will take longer to complete.