A brother that has studied the Book of Enoch says that the Ahl al-Bayt (AS) are mentioned in the seventh phase. If you would like his contact, I can provide it iA.
I have checked through the whole translated text of the Book of Enoch, and cannot see the quote you mention anywhere.
Here is a link to the pdf. It does not mention the names that have been cited in the title that you have mentioned.