The verses of this Surah apparently show that the Night of Honour is not specialized to the time of the descent of the Qur'an and the period of the Call of the Messenger of Islam, but it repeats annually until the end of this world.
Thus, its knowledge was removed, and perhaps it is better for you.
Imam Ahmad also recorded from Abu Hurayrah that the Messenger of Allah said about the Night of Al-Qadr, ยซุฅููููููุง ููููููุฉู ุณูุงุจูุนูุฉู ุฃููู ุชูุงุณูุนูุฉู ููุนูุดูุฑููููุ ููุฅูููู ุงููู ูููุงุฆูููุฉู ุชููููู ุงููููููููุฉู ููู ุงููุฃูุฑูุถู ุฃูููุซูุฑู ู ููู ุนูุฏูุฏู ุงููุญูุตููยป Verily, it is during the twenty-seventh or the twenty-ninth night.