In the following 2018 thread, it appears to have been reported that the buoy in question had been decommissioned and removed by Marine Patrol:
https://www.winnipesaukee.com/forums...ad.php?t=23002
Based upon the above, Bizer has removed the buoy from his maps printed in 2019.
The buoy does not mark any rocks. The depth around it is about 8 feet. The need for this buoy is questionable.