It requires continued adherence to the scientific method. As soon as you stop doing that you stop being a scientist, whether your name is Shellenberger, Lomborg or Watson for that matter isn't relevant. Science is what you do not who you are.
All he did so far was provide some data points. The "real" scientists should be able to explain them easily.
Btw, since I was just talking about her elsewhere, would you say Greta Thunberg qualifies as a scientist?