You have not established (haven't even given us a hint) that the process favors any particular direction.
Actually there has. EVERY time the data is "corrected" it cools the past and warms the present. Every single time. Only a brainless fool would ignore that fact.
Hello brainless fool
And after 26 corrections over 16 years the changes are massive and scientifically unsupportable...
Were gonna make the data more accurate after we Change the last chance, and the change before that, and the change before that, and the change before that, and the change before that, and the change before that, and the change before that, and the change before that, and the change before that, and the change before that, and the change before that, and the change before that, and the change before that, and the change before that, and the change before that, and the change before that, and the change before that, and the change before that,and the change before that, and the change before that, and the change before that, and the change before that,and the change before that, and the change before that, and the change before that, and the change before that,and the change before that, and the change before that, and the change before that, and the change before that,....
After 26 changes of 0.06 deg C (26 x 0.06 = 1.56 deg C) it doesn't take long to go way beyond what is actual or real and make up what it is you wanted..