As HRSDC mentioned in their remarks earlier, when an employer approaches them to determine whether or not they can hire a foreign worker, the employer has to lay out very clearly the requirements of the job. Quite often, official language ability is one of the requirements, but it's not necessary for a job offer to be validated by HRSDC.
When it comes to processing the actual workers' applications, CIC at the mission overseas does take into account what the job requires and the skills of the individual before the officer. They will make a decision based on the individual's demonstrated ability to meet the requirements of the job.