Tpc, I did reply to your email. Seems like it went astray. (You sent it from someone else's email account - maybe they have the reply.)
Anyhow, the situation is that the one page now covers all available information about changes to the word list, past and proposed. This includes all words added since Chihuahua started in 2005 and all changes between common and rare since 2013. For earlier common/rare changes, you can try a forum search. Not all those earlier changes were discussed in the forum, but for your purposes that's not a problem.
As far as I can tell the Chihuahua web site does not still have any link to the page that used to cover 2007 to 2012. But what I have now realised (in a high-lumen light bulb moment) is that the post pinned to the top of the Words board still had two separate links. I've now updated that. Sorry for the confusion.