I would have thought that vitabu would have been more appropriate here, as in "Rashidi reads books". Reading "a" book feels too specific in my opinion to suggest a habitual action.

I feel like the simple present in English isn't too far off. It suggests a habitual action but doesn't necessarily require a time phrase. (E.g., "I wake up early, work hard, and come home exhausted!" suggests a daily routine without giving a specific time frame).

It's the habitual form - referring to something they do every day. Apparently, Rashidi reads this one book every day, or at least on a regular basis.

Hu- is the same for all 1st, 2nd and 3rd person cases of I've understood correctly