It's actually helping him learn to read quite a bit - after voice transcription, he reads the post and edits any errors by tapping on the word and changing it. He's been on the cusp of reading on his own and it's the first thing that motivates him enough to do it naturally.

> But will he learn to read?

Of course he will, just not well. The point of the GP is that he doesn't need to learn anything because the AI can understand his verbal instructions.