this is not necessarily true. CIC has been known to process some outland applications in Mississauga to assist with overflow issues at other visa offices. applicants whose applications stay in mississauga for outland generally see a speedy process. considering a lot of people are getting speedy processes right now, this seems to be consistant with past reports of this...
it's also good to double check the langugage on the line about what type of application it is. does it say IN canada? or something more like sponsoring a member of family class? if it says IN canada, then that can be an issue and it could mean they have marked it as inland by mistake. don't freak out (i'm not trying to scare you). i doubt this is the case, it's just good to double check. the good news is, inland applications don't get acknolwedged as quickly as outland, so again, i doubt this is what happened.
if your application was suppose to go to vienna or ottawa, then most likely it's not an error and my guess is you'll see a quick process. just double check the language in the approval letter. it's not necessarily an error, just a clue about what they are doing for files that may be deemed "non-complicated" by CIC.