Where does the joy of Satan get all this information about meditations, rituals and holidays if in the holy books (Al Jilwah, Queret al Yezid...) nothing is said about it ?
Al Jilwah and Queret al Yezid are not our holy books, only some excerpts from them are on the JoS. The JoS itself is essentially our holy book, as the information comes from Satan and our Gods directly. If you study the JoS this will be apparent.
Where does the joy of Satan get all this information about meditations, rituals and holidays if in the holy books (Al Jilwah, Queret al Yezid...) nothing is said about it ?
Correct, but the JoS contains the entire Al Jilwah and Quret Al Yezid. They are small books of instruction and poetry, they were never meant to be like the jewish bible that is supposed to contain everything you need to know and practice. The Yezidis taught these things orally and didn't write them down. HP Maxine didn't omit anything from them, she included all of them. That's the reason why the part in the Quret that says "archangel over the host Melek Taus" is in the JoS. It's an obvious corruption, but it wasn't removed.
The only Yezidi text that is not in the JoS site is the Mashaf Resh. It's longer and full of Muslim/Abrahamic BS and has nothing useful in it.
Where does the joy of Satan get all this information about meditations, rituals and holidays if in the holy books (Al Jilwah, Queret al Yezid...) nothing is said about it ?
If you’ve read the Al Jilwah.
Satan says, “I lead to the straight path without a revealed book; I direct aright my beloved and chosen ones by unseen means.”