I think an AME that starts an exam has only a couple of weeks before
mandatory submission of his findings, yea or nay - completed or not.
The forms are numbered.

Remember that an AME is not supposed to be acting as your advocate,
rather you are hiring him just like any other FAA designated examiner
to check you.

There are two levels of AMEs. The Senior ones are given more
discretion by the FAA. Maybe this guy is a junior one trying to keep
his nose clean?

Even after the AME sends in his report, the FAA still has 60 days to
limit, revoke, or put additional conditions on whatever he may have
granted.

AOPA is good but not infallible. I'm sure anyone can join though & I'd
recommend it.

That's as I understand it. Been there many times.