You assert a pretty strong view, on what basis? but your hypothesis is directionally wrong, as found in these trials:

Screen readers take longer.

Feis A, Lallensack A, Pallante E, Nielsen M, Demarco N, Vasudevan B. Reading Eye Movements Performance on iPad vs Print Using a Visagraph. J Eye Mov Res. 2021 Sep 14

https://pmc.ncbi.nlm.nih.gov/articles/PMC8557948/?utm_source...

Another

https://users.soe.ucsc.edu/~srikur/files/HCII_reading.pdf?ut...

Tangential: One study finds few significant effects of disruptions on just on-screen reading, no printed books.. https://www.frontiersin.org/journals/psychology/articles/10....

Cited in Card Catalog , Hana Goldin, "What scrolling did to reading" here:

https://open.substack.com/pub/cardcatalogforlife/p/what-scro...