Hi @dubitator, welcome to AtheistZone. Yes, this is the legitimate successor to Think Atheist. There were various reasons for the change in site, notably issues with how the old site was hosted. The TA content has been retained as an archive.
You can find your own, and other vintage TA content by using search tips in my Tips Group. If you copy any content from TA to AZ, just make sure you don’t include any Ning links, since only TA has been licensed to use them.