I don't have any specific knowledge about Maple Leaf, but I would say it's one thing for an organization to claim that it protects whistle-blowers, and it's another thing for it to be real.
If you look at our own crown corporations here, there is actually a requirement as part of the Public Servants Disclosure Protection Act for all government departments and crown corporations to have an internal disclosure system that people can use, if they choose, before they go to the Public Sector Integrity Commissioner. If we look at that, what we find is that many of the largest employers have had zero findings of wrongdoing and zero disclosures. Canada Post has had not a single disclosure through that system in the past year, yet there is a whistle-blower right now in the news, Mr. Christian Dumont, who was hounded out of his job for drawing attention to a practice of selling afternoon routes, which has all kinds of problems for the integrity of the mail system. For his trouble, he lost his job. The courts have repeatedly found in his favour. Canada Post has been ordered to pay him $80,000. They still refuse to pay. A seizure order has been issued against them.
What I'm saying is that the contrast between what an organization may say it's doing and what actually happens in practice can be a very large discrepancy.