No predictions loaded for 2020. This site serves NOAA predictions from its own store, and this period has not been fetched for Dutch Slough 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/ca/dutch-slough-9415053/2020
Dutch Slough, CA tide table 2020 (printable) · Tide Almanac