Interesting and I am sure it works.
I tried to put some acoustic material on either side of my TV and it closed in the "presentation field" and it sounded more like box speakers. It was localized to more right and left and the center did drop out a good percentage. The center depth was gone. The "air" around instruments and vocals as well as some of the three-dimensionality that ML's are noted for was muted. Once I removed them it all came back, the dimensionality, the openness and the depth of the soundstage. I used some bath towels before I spent the money to test and I am glad I did.
Now in all fairness, I have a flat panel hung on the wall, about 2 feet or so behind the panels, a good 6 feet from each panel and it is angled downward a bit so the wall reflection is somewhat broken. I do understand that every room and situation is different and I am sure I would have done the same.
The main thing here is we all have compromises and that we do enjoy the sound of ML.
Jeff