What will happen to my IEEE conference paper if the status of the accepted paper is "AAR" I have been notified by the IEEE organizing committee that my paper has been accepted for their conference and requested to register. and the status of the paper is AAR. Please see the quotation below.

[AAR]This paper need thorough revision to be accepted as a full paper
for the conference.

I have attached an image of their review process.

What will happen to my paper after the submission of the camera-ready paper? Is there any possibility for my paper not to be published in the proceedings and IEEE Xplore? Or is it guaranteed to be published after the submission of camera-ready paper?
I think the flowchart in your question is pretty clear as to what happens next. But I'll break down the relevant part of the flowchart into words.

You have to make thorough revisions to your paper, and then resubmit. It will then be reviewed again.  As a result of the review, it may be accepted, and it may be rejected.

AAR: your paper's current status - accepted after revising. It's now up to you to make the thorough revisions, and to then submit the revised paper

REV is the status your paper will have once you have submitted the revised paper.

RVI will be its status when the revised paper has been sent out to review. Judging by the flowchart, it will get sent to the same editor and reviewers as before, because a revised paper does not pass through the WFR stage of waiting for review, where reviewers and editor are assigned.

It may then be accepted (ACC), rejected (REJ), or conceivably, according to that flowchart, get returned to you once more as AAR for further revisions.

The flowchart also suggests that whether it's accepted or rejected, you still prepare a camera-ready version. That would seem to be very unlikely: I find it very hard to believe there's any use for a camera-ready version of a rejected paper; only an accepted paper would need a camera-ready version.