How good are you at this game?
I am playing at the highest level in my region (South East Asia), but this does not matter as that level means nothing compared to the Japanese. And while I’m not playing at the world level, this does not correlate to the quality of the material. While I might not be the best player, I am an extremely analytical person and have experience teaching many people, which is a trait lacking in many strong players.
Why should I care about your guide and don’t go study pro replay myself?
Because I've done the thinking for you. You can go watch a JP replay and try to "guess" why they do a certain move yourself, or save time and allow me to do it for you.