From what I’ve gathered the X95 MSW was never a Full-Auto firearm, it was designed as a Semi-Auto for use by the Israeli police (selector switch only has 2 positions S&R). The issue seems to be that the MSW receiver is capable of excepting a Full-Auto trigger package making it prohibited under the Firearms Act.
I find it hard to believe that both the importer’s verifiers and the RCMP inspectors missed this pretty obvious item.
Regardless, if you received a “Revocation Letter” you should file a referral under S.74. If you fail to act within the 30 days the RCMP could revoke your RPAL for non-compliance.