'I say this as bone loves to form in areas of high load. And we do not want unnecessary annoying osteophytes growing in the cartilage repair.'
By this I mean that when the surgeon disturbs the underlying tissue to stimulate the cartilage it is also probable that osteoblasts (bone forming cells) are released. I think there have been some advances in the drilling techniques of the subchondral bone to minimise this. We see this in facet joint surgeries in the spine. Osteophytes make bone and respond to load. So as we would want to minimise bone formation I would take a slightly more conservative approach to the load bearing rehab in order to minimise that.

In terms of squats I would cut them out completely for now. Too much load. Progress will being with restoring full range body weight squats. Perhaps think more yoga or more active things like kettle bell type lunch and squatting movements at some stage ahead of squats specifically. In some ways depending on where the lesion is can help our therapist to provide more insight into which movements will load the area vs. those which will not.

;-)

p.s. I did not see the attachment so perhaps that failed when uploading