Based on the assertions you were making above, I was expecting the study you linked to have to do with cognitive impairment and masks. Its only discussion of masks is a theory that perhaps the fact that test administrators wearing masks might have affected the measurement of the results.

"Although all study visits were performed in-person, the inability of infants to see full facial expressions may have eliminated non-verbal cues, muffled instructions, or otherwise impair the understanding of test questions and instructions. Without direct comparison of performance in the same children with and without face masks, it is difficult to rule in or out the potential influence of masks."

How does that compares to the kind of cognitive problems created by long covid, i.e. riveted to the bed and/or unable to read/concentrate/think ever again, etc?

Have you seen what happened to Physics Girl? (and she was vaccinated, but still the likelyhood to get it would have been ever greater without the vaccine)

To lower the proba of getting that, I would eagerly accept any gap in the development of my facial recognition abilities.