is there a current walkthrough? the one I have is dated 2010

Is there a walkthrough for this, please?

J’ffrey’s walkthrough is still relevant. But as mentioned, you’ll need an assistant to complete Ahnonay on MO:ULa.

Is there a way to reset the age, deleting the book doesn't work

How do I reset an Age to its initial state?
https://eblong.com/zarf/uru/newfaq.html#age-reset

You will almost never need to do this. It should always be possible to turn off or reset the devices inside an Age -- either the same way you turned them on, or by some alternate means.

However, if a bug or some other problem has truly made an Age unplayable, there is a procedure for resetting it. This will undo everything you have done in that Age -- machines will be off, puzzles will be unsolved.

First, you must delete your existing linking book. Go to your Relto bookshelf. Click the "remove" tab below the Age book. (This tab (at bottom of a book) is marked with the symbol of a square with a dot inside.) Confirm that you want to delete the book. The book will slide inwards. Leave it there.

Now, go back to where you found the book originally. (For example, if you are resetting Gahreesen, go to the Relto pillar that held it. The pillar will be open.) Use the book. You will enter the Age at its beginning.

Note: this procedure does not reset your Journey progress. Cloths you have touched are still counted as touched.

Some Ages cannot be reset: the City, the Cleft, Nexus, the Neighborhood. (The Neighborhood "remove" tab is used to switch Neighborhoods or create new ones. See "How do I change my home to a different Neighborhood?" "How do I create a new Neighborhood?")

Sorry but your remaks are not precised enough as to what you have done.
Where you talking about Uru Live or Uru solo(cds)

1- In Relto what happened when you deleted the book ? Did it go at the back(deleted) ?
2- Did you go to the Watcher's pub to get a new one ?
3- Then happened ? Did you see any cloth page still present ?

In this new version of Uru Live:
1- After deleting the Ercana book you have to get a new book in the Watcher's Pub through the Nexus book.

2- in this version, there is "no" cloth near the Ahnonay chair ride. It is due to the obsession of Cyan to promote a kind of meeting place/date between players (boys & girls).

3- Because the chair ride can be very buggy we suggest you go in "first view" before sitting in the chair up until the end when getting into the lab.

4- If ever needed, you can delete the Ahnonay book but if deleting the Ahnonay book (Cathedral and the main one ) they will be deleted at the same time. You would need to get the Cathedral in the Watcher's Pub which will give you the 2nd book when linking through it to the first island.(becare for the sqabs).