Hi debating,
I do think highly of Majestic but I don’t know which of their mattresses your question is referring to. The 6" and 8" Restore mattresses and the Unison mattresses that they list on their website here are “all latex” mattresses that use certified organic Dunlop latex and don’t contain any synthetic latex or any other synthetic foam materials (only 100% natural Dunlop latex can be certified organic).
They are clearly wrong.
I think that I’ve answered this in my previous replies. All the latex you are likely to encounter (either Dunlop or Talalay that is made with either natural or synthetic rubber or a blend of both) will have a reliable certification such as Oeko-Tex, Eco-Institut, or Greenguard Gold (see post #2 here) and based on actual testing I would consider any type or blend of latex to be a very “safe” material in terms of harmful substances and VOC’s but the only way to make specific comparisons about VOC’s between any specific materials or mattresses would be based on seeing the lab testing results.
Phoenix