They can't even say that.. law trumps contract. I had to look that up for vancouver, but..

"employers in B.C. cannot dismiss, suspend, demote, discipline or harass an employee who:

• Asks their employer about their pay
• Reveals their pay to another employee or someone applying to work with their employer
• Asks the employer about its pay transparency report
• Gives information to the Director of Pay Transparency about their employer"

https://www2.gov.bc.ca/gov/content/gender-equity/pay-transparency-laws-in-bc