Reports
Certainly there is no simple arithmetic that requires increasing screen based learning to be directly linked to diminishing paper based learning. Or is there an arithmetic that requires that increasing formats for oral (aural/visual) communication need to be linked to diminishing formats for text literacy (print). Or will increasing screen readership and diminishing print readership necessarily relate to measures of reading comprehension overall. More likely increasing skill sets for comprehension of conceptual works will layer and accumulate and feature increasing varieties of technological mediation. This has been the norm across media history.
Reports of withering reading skills may be based on a arithmetic which delivers the wrong answer inverted.