Utterly ridiculous nonsense!
Claim That Sea Level Is Rising Is a Total Fraud

Sea levels began to rise 18k years ago at the end of the last glacial period. They have risen about 135 meters since then which is an average of 7.5 millimeters per year. That is an average of 750 mm per century (29.5 inches) which is far more than the average over the last century.

From 1880 to 2000 sea level rose about 20 cm or just under 8 inches. Far less than the nearly 30 inches per century average over the last 18,000 years.
Nothing else they have to say is worth considering if they will lie about an established fact.