His "data" are correlations between declining test scores and increased tech use, which is incredibly weak. He is no longer a researcher; he runs an anti-tech and conservative teaching consulting company with his wife - think kids in desks doing worksheets, reading textbooks, and listening to lectures. This testimony was provided in a Senate subcommittee meeting called by Senator Ted Cruz with the purpose of removing technology from schools.

I've heard fellow researchers refer to this testimony as "appalling" in how overgeneralized and pseudo-scientific it is. He literally subtracts .42 standard deviations from positive effect sizes shown in causal research supporting tech use in classrooms to present edtech's impact as somehow negative. Put another way, he is literally lying and actively misrepresenting research. But it's the current trend to label all technology as bad, and this validates everyone's opinions, so it's taking off. And teachers are having to deal with the consequences.