Hi Ted,
I’m not sure what your agreeing or disagreeing with. Mattresses have to pass 1632 and 1633 as a complete unit (not as individual parts or components). Their mattresses have all passed both and their replacement components that are not sold as complete mattresses in a single shipment don’t need to. The page you linked to is the page where they have their replacement mattress covers.
nontoxicbeds (Strobel) has some very good information but not all of it is exactly accurate … particularly the video and information about using wool as a fire barrier. See post #2 here. As a side note they also don’t like to disclose the density/quality of their individual polyfoam layers but they are 1.5 lb density (which is on the low end of the density scale).
You’re not quite correct … but you can talk to them if you wish or better yet order a mattress and you will see the compliance tag :). They sell mattresses of various types and designs that have all been tested as a prototype and passed the fire code. These mattresses are the designs that they sell and ship out as complete mattresses that have been approved with the tags attached and are shipped out as individual pieces through UPS … much like other manufacturers who do the same thing. They are an actual manufacturer with their own factory and they cut latex and make their own mattresses within their tested prototypes which they in turn sell to customers. The customer is not the manufacturer. You are a little confused but I understand that its a confusing subject 
Phoenix