Spellers but not Readers--update re peripheral vision

(A follow-up to an earlier post).

I've just encountered another claim about how facilitated individuals read--this one in reference to a person with FOXG1 Syndrome, a rare neurological condition that can cause significant intellectual impairment and autistic-like symptoms.

This individual, currently a student at Columbia University, is facilitated not via a held-up letterboard or by a facilitator's hand on some part of his body, but by the facilitator holding his torso and directing it towards one of six large, color-coded buttons that, pushed in combinations of two, select specific letters on a computer.

You can see it here, starting at around the 54-minute mark.

The claim is that this person, while refusing to wear his prescribed glasses, can read through peripheral vision. From the above-linked video we hear the Dad say:

He can read, like, a book. It’s really hard for him. You have to mask all the other lines so he reads one line at a time. It’s really difficult with his movements to look at something consistently. He does I think they call it “keyholing” where he looks out the side of his peripheral vision. He’s better than I am for sure but with his peripheral vision he sees everything.

As Janyce Boynton has discussed, it is highly unlikely that anyone can read via peripheral vision.