I would assume they do. I use icy dock myself and frankly, if I were ordering a MP today I would take the SSD matters into my own hands. They're already priced well beyond what they may be worth (imo), why pay Apple tax on a sub-standard SSD?
If you're referring to "The solid state drives (SSD) come with adapters that fit the 3.5-in drive bays." line. I presume that's just general information for when you buy a SSD. The instructions I posted don't make any use of them.