Tom, I enjoyed the strawmen (e.g. "No audiophile I know is a cannibal! If you like that, that's your personal preference!"), though I once read an interesting review of the D&D 8C (note floor and windows behind at http://6moons.com/audioreviews2/dutchdutch/3.html), also the Kii Three (note...
I've combed through his website to look for an explanation for his recommendation. Based on https://www.linkwitzlab.com/rooms.htm#rear%20radiation, https://www.linkwitzlab.com/faq.htm#Q31, and statements like in https://www.linkwitzlab.com/AES123-final2.pdf, I believe that the argument is that...
Just out of curiosity, have you tried diffusion behind the speakers and absorption behind the listening position, as per Linkwitz's recommendations?
https://www.linkwitzlab.com/rooms.htm#D