That book is still fine for learning from, DNS is a fairly stable thing and not a lot had changed. There have been new features added, but that will not affect the foundations you learn there. It's worth noting Amazon has the date wrong, it seems to be 2009, not 2006. Though it could just be an update/revision shown there and Amazon is listing date of first publication.
You may add https://www.amazon.com/DNS-BIND-IPv6-Next-Generation-Internet/dp/1449305199 to your list for later reading too.