It is 3.4mm/year according to the NASA site you linked to...
+/-0.4mm/year and I am sure the 3.21mm/year had error bars-a concept that seems to elude you. These are the results of averaging many measurements so they got 3.21 with an error bar... they were not claiming they had a measurement precise to 0.01mm...
They even give you a link to download the data, and the data header explains how it was measured...
HDR This file contains Global Mean Sea Level (GMSL) variations computed at the NASA Goddard Space Flight Center under the
HDR auspices of the NASA MEaSUREs program. The GMSL was generated using the Integrated Multi-Mission Ocean Altimeter Data for
HDR Climate Research (http://podaac.jpl.nasa.gov/dataset/MERGED_TP_J1_OSTM_OST_ALL_V4). It combines Sea Surface Heights from
HDR TOPEX/Poseidon, Jason-1, OSTM/Jason-2, and Jason-3 to a common terrestrial reference frame with all inter-mission biases, range and
HDR geophysical corrections applied and placed onto a georeferenced orbit. This creates a consistent data record throughout
HDR time, regardless of the instrument used.
Yours is the only ignorance you have demonstrated, and you are alleging a fraud on the same scale as that claimed by flat earthers and those that claim moon landings were faked.
the methodology and data is online- the fact that you don't understand the science is not proof of an evil conspiracy... it just means you are ignorant... and more than a little insane.
Do you have family that can take your keyboard away when you enter the manic phase of your disease?