he's on the daz forums as xaa.  you don't have to buy anything to be a member.  and yes, he did mod posette so she can get in those poses easily.  but he also posed her very carefully.  that is to say, he optimized her for his own use, which meant one body part would do most of the bending while another would do most of the rotating.  i'm not explaining well at all, but it seemed to me that while he felt this was a challenge to figure makers, i thought of it much like someone who's written their own software.   it  proves a solution is possible for a single user, but not necessarily for general usage.   that said, he always says he's not an expert, and if he can do it, the experts can.  but i think he might be underestimating how much harder it is to do something to at least meet someone else half way on workflow. 

here's a link to the thread: http://forum.daz3d.com/viewtopic.php?t=51385&postdays=0&postorder=asc&start=0
warning to those who feel the need to vehemently dismiss anyone raising issues with v4 - it's a thread criticizing her bending and showing better counter examples.