I believe there is some confusion here. I hope I can help.
On the spells8.com website (where the link I gave you and the one you posted came from), I do not believe @Francisco made any previous information unavailable after publishing an astrology book.
I do know that @Cosmic_Curiosity has created numerous astrology threads, including several for learning that are still available if you go to the astrology tag and look through past posts. He did publish a book on learning astrology for sale but the information on the forum is still available.
Using the forum’s Search engine can help you find past posts. For example, “Astrology 101” will bring up many of the ones he posted in the forum, including Learning Astrology 101: Exploring Planetary Returns Part 1
You can also find others using the terms “Beginner Astrology” which will show you other learning posts in his series, including Beginner Astrology - Guide to the Elements
I hope this makes sense and is of assitance! I know the forum can be confusing to navigate due to the sheer number of posts! 