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Thank you so much for your reply, no worries about timing!
Reading about your case is really a great hope for me!
I am a PhD candidate in the Humanities program at Concordia, but I used to be a visitor scholar last fall, then traveled out of Montreal for a job and got stranded out. Meanwhile, I got accepted as PhD student. Originally I was planning to return to Montreal with my SO, and apply at POE as US citizen. But COVID came and I haven't been able to come back. Therefore, I did call CBSA and the officer said that my case is non-discretionary because, I used to live there and I' am returning home, and my research lab activities are presential.
I do have two letters from my advisers (with the official university letterhead) and even from the Dean of my department informing me that I must be there for lab activities, and the labs have been re-opened. My activities in the lab and with my advisor are related to theater activities and media recordings of residents of Montreal.
My ISO office is advising me to be very careful and a bit discouraging since I don't have an SP or an IRSS final letter. I believe they don't want to disclose info about the number of students who crossed (or might not have information about) US students who did it only with the AIP letter.
I'm really scared about the act of going to the land border because I only have the AIP, along with the other essential documents (even my apartment lease!). I really hope I have an understanding officer like yours.
Thank you for reading and posting about your case!