I happen to live near one of the main weather stations which was caught up in that FOX News brouhaha and happen to know about the local history. tl;dr as usual, the whole story was all a load of vaporous bullshit. And apparently it worked since you took the bait.
One hundred years ago the local weather station was established outside the harbor master's office down by the docks (and the water). The city grew up and forty years ago or so the weather station was moved 500 feet up a hill to outside the local observatory, which is surrounded by forest.
Moving a temperature sensor away from a large body of water, out of a "heat island" of now-paved urban roads, out of a canyon of concrete and glass buildings, and to a higher elevation will all change the readings of the sensor. If you want to keep a continuous record before and after moving, before and after various construction projects and re-roofing nearby, and before and after population changes, you're going to have to figure out and apply a correction factor for each of these things.
There is nothing particularly unusual about our local weather station's story which hasn't been repeated in most cities around the world. So it is not surprising that noisy long term time series need to be cleaned up before being fed into sensitive predictive models. It would be dishonest not to if you know there was a change in the sampling history which required it.