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As you know the processing times are only estimates not committments so my guess if there is no change then no point in changing the update date.
 
So date last modified on that page was 9/19, today is 9/25 so 6 days ago. The processing times are estimates as you probably know and as estimates probably do not change much anyway.
Not everything was updated on September 19th. I noticed that inland application processing times (work, study, visit) have not been updated recently, for eg. work permit extension times were last updated on September 8th.