He should have to prove his hypothesis. Their data has already been taken apart like LEGO. An empty and cheap trick designed to get media coverage. The ‘judge’ for this will be global warming zealots who are hysterically convinced of their own manipulated data.
What would be interesting is if Congress would mandate that no US-paid weather station could not be within half-a-mile of any concrete or asphalt structure. This would force the relocation of almost every single site put up since the 1940s. It would also change overnight the data collected once the new sites were put up and everyone would asking if there was some correlation between urbanization and heat....which the heat-sink-collection concept would finally dawn on folks.