That's the only logical reason I can think of as well. Zoom , has participant limit of 100. Still they can easily do 5 ceremonies a day across Canada. That's 500 people
CIC is a mess, this is what my GCMS notes say "Verified photos and ID for online test - no concerns" and they rescheduled me for a test on Aug 30th and not replying my emails.
My new update says that I need to take citizenship test on 30th Aug. Will wait for instructions to see what that is . It doesn't say online though so I am guessing it might be at center
I asked CBSA and this is what they said "I do not know if IRCC contacted CBSA, I can only provide records so if the travel history is the only one you want let me know."