Based on what you posted MSP waives the up to 3 month wait period because they have been in Canada for many months. Seems like that is up the MSP worker.
Still not sure what you mean. The wait period is never waived. Instead of using the date of arrival in BC to start the wait period, MSP uses the date the app is received by IRCC or the date the fees are paid. Time before either of those actions is not counted towards the wait period.