Some real adult programming language which can be used with braille terminal and/or screenreader. However as I am not user of any of those things I cannot recommend which language works with them, but I would definitely try python.
I would also try swift playgrounds if the kid is used to voice over.
Scheme IMO is the best for both sighted and blind people. There's very minimal syntax and I'd imagine a good editor with s-expression motions would make things much easier if you can't see.
Edit: I have no idea where I got 10 years old from, the post clearly doesn't list ages. In any case, I am leaving it on the offhand chance someone chimes in with a story about their kids learning scheme.