The fin pivot was removed from the PADI course nearly a decade ago. It is still an option to show that breathing in makes you go up and breathing out makes you go down. Any exercise that teaches that concept is acceptable.
If you are properly weighted, it should require very little air in the BCD. How much weight were you wearing at the time?
You are supposed to put the air in your BCD, not the instructor.
Did you also ho er while adding air to the BCD orally? If so, did the instructor breathe into your inflator, or did you?