That is NOT true. A person can still include an OWP with an Inland application:
canadianimmigrant.ca/news-and-views/implied-status-what-is-it-and-what-changed-recently
(from link above):
Some recent developments
While the above may be common knowledge to many readers (and judging from some of the emails that I receive in response to my articles, many of you are quite well versed in Canadian immigration law), there were recently some significant procedural and court decisions that have received little attention.
The procedural change is that CIC has announced that Inside-Canada Spousal Sponsorship applications can no longer be sent to CPC-Vegreville, but instead must be sent to CPC-Mississauga. This led many people, including agents at the CIC Call Centre, to mistakenly believe that applicants could no longer benefit from implied status during the processing of their Inside-Canada Spousal Sponsorship.
This is not the case. Work permit extension applications* can continue to be included in Inside-Canada Spousal Sponsorship applications, where they will be processed to conclusion. The result is that Inside-Canada Spousal Sponsorship applicants can benefit from implied status during the processing of their permanent resident applications.
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* This would also include OWP
To answer your question, your OWP (whether it is in Missassauga, or Vegreville) wouldn't be processed until AIP anyway, so it doesn't matter. Whatever you do, do NOT send another OWP.