I don't quite agree with this. For instance, my cousin and his girlfriend have the exact same profile, the same collection, workplace, etc. They even submitted the application on July 15 at the exact same time to the very second (you know, lame things couples do lol). My cousin got his PR on March 23; she's still waiting despite having the same profile.
While it's possible, I believe that the remaining ones are halted due to reasons just best known to IRCC. Maybe they're sure that the remaining applications will be completed by year end so they switched priorities?
As for me, I submitted (everything upfront) on July 16 just half an hour before the stream closed so I know I'll have to wait some more. It's fine as my WP doesn't expire until August 2024.
Been looking forward to the summer since the dark and gloomy days of winter. Not going to let PR deter me from making the most of BC's beautiful summer