Is that the scope and underlying understanding of this book?
Clarification of the Question
Alhamdulillaah, we know Shaykh Al Albaani considers all of those hadeeth saheeh, and he was a capable muhaddith, rahimahullaah (may Allaah have mercy on him).
The question is: Did the shaykh consider that he had compiled all the saheeh hadeeth in existence to the best of his knowledge?