A good scientist would have issued a correction something along the lines of «I missed the fact that tidal gauges are influenced strongly by local changes in
land elevation due to river silt, human activity, post-ice age rebound, and earthquakes.
You've also failed to use the data properly and haven't corrected the gauge readings for post-glacial rebound,
land build - up
due to silt deposition,
land elevation changes
due seismic events, or subsidence
due to ground water pumping or soil compaction, all factors that the PSMSL (your data source) says must be corrected before using the data.