The HR departments out looking for 'Purple Squirrels' is a well known technique for justifying foreign worker recruitment. (They actually use the term 'Purple Squirrel' BTW.)

So what they do is put out job ads that no human in Canada could ever fulfill such as very specific technical knowledge combined with many years of experience, or impossible combinations of experience and credentials. This allows the firms to reject every Canadian applicant and then whine to the government about the 'skills shortage' and the fact that there are "lots of Purple Squirrels in Elbonia".

Of course Elbonia doesn't have any purple squirrels either, but they do have people willing to work cheaper than Canadians, and the government never checks back to verify if the purple squirrel actually does have the credentials.

Mission accomplished.