Raw US HCN data matches RSS satellite US data very closely. This tells us that the raw data is fine, and there is no need to adjust it.
But the problem for NOAA is that the raw data doesn’t show any warming, which means no funding, so they cheat by cooling the past and warming the present. The next graph compares their tampered data with the RSS satellite data. The tampered data diverges from satellite data by 1.4ºC per century.
There is no basis for the tampering, and it is obvious that NOAA isn’t doing any verification vs. satellites. Junk science at it’s absolute worst.