https://sightlessscribbles.com/about/

> Kingett has Cerebral Palsy, CP, in addition to his blindness. He’s had both ever since he was a baby. He has Retinopathy of prematurity, commonly referred to as ROP. Even though he is ambulatory, his cerebral palsy makes it difficult to walk long distances or to stand for lengthy periods of time, which is probably why writing fell right into his lap!

So it sounds* like he uses his cane from his wheelchair and/or when walking.

*unintentional metaphor

Never mind, then. It's just bad writing.