No predictions loaded for 2020. This site serves NOAA predictions from its own store, and this period has not been fetched for Oak Bluffs yet. Nothing is estimated or interpolated in its place. NOAA's own page for the station has the official table: tidesandcurrents.noaa.gov.
tidealmanac.site/us/ma/oak-bluffs-8448208/2020
Oak Bluffs, MA tide table 2020 (printable) · Tide Almanac