As I said, you have to use a site search. It wouldn't be hard to find out the name of this site. You didn't look at the list in full, did you? Look at this one:

Forums at Psych Central: Qs @ user names
... Another recent post was a notice that a forum member was reverting to a previous user name, having adopted a temporary one due to a computer problem. ...
forums.psychcentral.com/showflat.php?Cat=&Number=96316&page=0&view=collapsed&sb=5&o=&... - 57k - Supplemental Result - Cached - Similar pages

That link goes straight to the forum. It's not from the newsletter. And you don't have to go to the forum to read it. You can click "Cached," and you'll get the page as it was recorded that day.

However, DocJohn or someone must have contacted Google in the last few minutes, because those forum links do not come up now.

But there are still five pages that come up on The Wayback Machine from forums.grohol.com.

Most search engines honor sites that disallow access to the robots.txt file. That's why some sites are not listed, or certain pages from some sites aren't listed.