Hi sundance,
Yes … I read the post you linked and I also made a long and detailed reply in post #3 in the same topic but I’m not clear about what you are specifically asking me.
This is the part that I don’t know what you mean. I don’t know of any latex mattresses that have “metal framing”.
If you are referring to metal innersprings and some of the “controversy” about electromagnetic fields then you can see my comments about this in post #8 here and it’s certainly not something that would in any way concern me.
Phoenix