Solid Hardwood Floor Installation

I am in the process of obtaining quotations for 35sq metres of solid Merbau hardwood flooring (not engineered) to be installed in the open-plan lounger/diner of my 200 year old house in the south of England. The existing floor is carpet over concrete and I am limited as to how high I can raise the sub-floor (thresholds, fire hearths etc).
As such, the method proposed by one company, who have visited the property (Craftsman Timber Floors Ltd - /) is quite tempting. Their approach is to stick the boards to an elastic material (I believe it is called Tuplex) - which apparently expands with the wood as well as provides a waterproof and 'breathable' protection - to quote, "the inherent problems caused by moisture becoming trapped in the sub-floor are eliminated".
Has anyone heard of this product/method and if so, is it a sound way to approach the installation of a solid hardwood floor. Having read previous posts, I understand that nailing to a plywood sub-floor is the preferred method, but times change and new products are introduced, so maybe this is now acceptable?
Any feedback would be most appreciated.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
Add image file
Upload is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.