The paper says that covering flat land in windmills will disrupt the flow of air, increasing turbulence, and thus decreasing the wind's ability to transport heat from the land. This is really only relevant if you consider a flat continent covered in wind farms. On a smaller scale, the heat has nowhere to go. Turbines don't do anything that trees and buildings wouldn't.
Barton's statements (and I'm afraid I don't have access to the full record), appear to be making a slightly different point. He appears to be arguing that wind is finite, (which is sort of true, but well in excess of the scale of extraction a continent-wide windfarm would involve), and that this is some kind of limitation that we need to be concerned about (which is false).
What this appearance is based on is another matter. It might be that either Barton is ignorant, or that he thinks the House is ignorant. It may be that he's trying to use the study honestly and has given an impression at variance with the facts entirely unintentionally. Or it may be that, as a climate change denier and client of numerous oil firms, he has a vested interest in presenting the study in a manner that doesn't reflect its content.