Not "wrong", dubious.

It is quite appropriate to call such declarations dubious.

Your explanation is fine, however, this 'no evidence' refrain that has been used to mislead the public has gone on long enough. At this point when that is in print the assumption may as well be the opposite.

Every sensible person can see that children are not developing as they have in the past and the clear major difference is full attention grabbing effect of media. But no, no, it isn't the 'screen time'