Did I really have a canthopexy or similar according to surgical report?

It sounds like you had midface elevation and malar implants. A canthopexy or canthoplasty would require an incision somewhere around the outer corner of the eye or upper eyelid to place the canthopexy suture. With that said, release of the canthal tendon from the lateral orbital rim, not recommended, can give you a lateral and upward pull of the corner of the eye.

Putting a suture under a cheek flap to the temporalis muscle is not a canthoplasty. Canthoplasty or canthopexy are specific surgeries performed on the lateral canthal angle. That does not sound like what you had based on the information you have provided. It can't be done through the mouth.