That is accurate. Also consider that Earth accumulate more matter from space on a daily basis. I have no doubt that the CO2 that falls to Earth from space is negligible, but it is something that needs to be factored in.
As far as the rise in sea levels, is the amount of groundwater extracted by Mankind from the underground water table on land factored into these equations as well?
So many variables...
About 6% of mass of falling meteors is out gassed as CO2 and 12% of their mass is water vapor. Methane is also produced.