People heal at different rates so using a “blanket” time frame for all knee recos is stupid IMO.
And like the “Good Doctor” says there is no real way of seeing if the knee has healed to the point of the surgeon being confident, other than just the obituary usual time frame.
So to me that says the surgeon is basically guessing too.
Take a look at Dale Morris, I’m sure he would have got the all clear from the docs, so they aren’t always right. And that means right both ways.