Perhaps, but that was not the statement. The statement was:

Kelvin is objectively the most accurate.

Functionally, a measurement system cannot be inaccurate. You might define a new temperature measurement in blargs, and define that the room you’re in right now is 1 blarg. It is now an accurate statement to say that the room is 1 blarg. At the time of measurement, it is not possible for that statement to be inaccurate.