Keep in mind the only glue holding the logic board to the metal case is a small rectangle of adhesive. In the picture, the author is just scraping away at the glue. You don’t need to insert your spudger any lower than half an inch as there isn’t any other adhesive holding the logic board to the metal case . Once the glue has been scraped away, then the board should slide out easily. If it doesn’t slide out, then the adhesive is still there.