Hi Dr.Ake,
No worries at all! I’ve had some issues with such sites surreptitiously attempting to use TMU for their own SEO and promotion.
It ultimately depends upon the tightness of the cover, but in this case making the items “less independent” can increase the transfer of motion waves in the sections.
Memory foam is the best at motion isolation but latex and pocket coils are good for this as well (see post #18 here). Post #2 here talks about latex and motion separation. Overall I would think it’s reasonable to say and most manufacturers would agree that latex is “good” with motion separation, especially the slower heavier types of movement such as turning over or bouncing or getting out of bed and are an improvement over other materials (except memory foam) but again this depends on the type of movement or vibration and the specific construction of the mattress, the ticking and quilting materials, and the materials or components above and below the latex and even the bedding above the latex as well.
And if the memory foam layer was changed to another foam in the newer Luxi design, this could also have a negative impact upon motion transfer characteristics (Luxi still hasn’t replied to me regarding the newer materials).
Phoenix