Yes well that's a point of confusion. Most comb foundation, the thickness of the cell wall is much thicker than the wax cell wall that the bees will build on top of it. So they are claiming an <inside measurement> of 4.93, but that is just the shape embossed on the foundation, and not what will be the inside measurement of the cell once it is built by the bees.
The accepted method of measuring cell size is across 10 cells, so to be clear, they should be using that method.
Pretty much all foundation sold falls within the natural range of sizes, so, by a keen marketer, any foundation could be marketed as "natural size". But because of the beliefs and controversies around "natural size", any comb foundation seller should state the actual size, using the normal measurement method, to remove misunderstandings.
I rather suspect that they think they will sell more comb foundation if they say it is "natural size", than if they do what all other comb foundation manufacturers do, which is to state the actual size. It's also likely a bunch of 4.9 cell believers will buy it, because in their minds, natural cell equals 4.9. But they will have been duped, because the cell size is just over 5.1.
The 4.93 they mention is obtained by a measurement method nobody uses and in my view is a marketing ploy aimed at small cell believers.