Hi.
Exactly this is what happened to me.
I first got an email saying my plan was insufficient. I replied to them the same day with a
detailed quarantine and travel plan. I even went ahead and booked accommodation for a month (i did a booking on booking.com with free cancellation). even shared the details of the closest grocery stores that were offering online deliveries.
about a week ago I got a reply saying that "
medical had been extended to February 28th, 2021, and that I had 10 days to reply to the email if I wanted to fly out before the expiration of my medical. The same email also said that a future extension would not be guaranteed without a re-medical."(sorry copy-pasted what you said in the post, as it was the exact thing for me, even with the same medical dates).
I went ahead and replied to them saying I am willing and want to go to Canada as soon as possible. Considering the content of the email i assumed i will be issued an AL soon as I was ready and my medical was extended.
3 days after I replied with the filled form, God knows what happened got a new email saying I was asked to do my medical exams !!!.
I honestly don't know what is happening with IRCC. first, they tell me that my medical is extended and I should travel before that date, when I say I am ready they ask to do the medical anyways.
I could be very wrong, but I feel more than 2 IRCC agents are working on one application and these 2 agents don't know what the other is doing. because half of the communication is coming to my emails directly the other half communication through my GCKEY profile. I can't think of any other reason for this confusion.
Anyway, I hope you are not asked to do medicals, and good luck