There is a lot of ignorance in that thread though. This is one of those subjects where you should be very careful about who you listen to, given all the disinformation floating around on the internet.
You have places like gearslutz, which is, as far as I know (though I haven't been there in a long time), the biggest audio engineering forum out there. The community, as a whole seems to disagree with the very concept of an AB, or ABX test. I mean, it's approached flat-out superstition.
The thread that finally made me through up my hands and leave the place was when a big post erupted after a very well respected member of the community had the gal to suggest that microphones were not filled with magic, and thus limited to physical properties. It devolved into personal attacks against the guy, and his education, and people asserting that "science can't measure what I'm hearing."
I hate this industry...