arafiq,
That's usually the question I get when I post those photos :-)
The explanation for the positioning is here (where I also post photos of my Thiels in the same room):
As to the sound: Fortunately, there are no discernible sonic consequences to the right speaker being in that position. Sometimes it's further away from the sofa, sometimes I pull it right up for more nearfield listening like in that photo.
I'm sure it works because the drivers are up higher over the sofa (same with my Thiels) and so aren't impeded at all, and bass frequencies not being directional.
So there's zero balance issues in terms of the L/R sound that I can detect. Bass sounds terrific too!