Thanks for your answer Sarab. The reason I am wondering about the police check is because it is written on the IRCC website:
"In
very rare cases, we may accept both a letter of explanation and proof that shows you made your best effort to get a police certificate on time. "
So I was hoping, as I provided those proofs, that they could make an exception.
Regarding my current timeline, there's been a twist today: I received an email saying that the Biometrics Collection Letter was sent by error

Even though it was just after my medical was approved...and even though my application status shows "Requires your action" and the Biometrics shows "We need your fingerprints"... I have my appointment in a few hours for collecting those biometrics, not sure if I should really cancel. I think I am going to try it anyway.
Anyone had the same issue ? Can I use the webform to ask what this is about, even though i am only 2 months after my AOR ?