There are several fallacies here. Even if there is no standard by a governing body, most people would regard khukuris with a thin and flat blade as outliers and unsual at least. Further, even if calling a kukri machete a "kukri machete" were calling it what it is, there must have been someone who did so the first time.
I think
FortyTwoBlades has answered the question, but I'd like to add that the word "kukri" is a mispronunciation of khukuri which seems to derive from Sanskrit "kshura - kshura" which translates to "sharp blade - sharp blade" (did someone stutter?) which is really just onomatopoeia for the sound produced by swinging it through the air! So a kukri has to be a sharp tool long enough to make that sound when used

I wonder who in Nepal (or where-ever) established "khukuri" as the term for a tool of the shape we are familiar with... but the East Nepal versions are called "Siru-pate" to associate their thinner blade-shapes with the Siru plant's leaf-blades that they resemble.
In contrast, the word "machete" is the Spanish diminutive of "macho" = masculine, strong, etc., so "machete" = little man. This is comparable to the term used in other parts of the world for the same type of tool, derives from Latin, "cutlass" = little knife. Given the size of these tools, why would either be referred to as "little"? Well, because the comparison is to longer & heavier cutting tools, swords! In effect, "machete" = "short, light-weight sword".
As it turns out, BOTH tools evolved from the short swords of ancient times (e.g. kopis as mentioned above). It is fascinating to me that the machete has seen such expansive evolution into various shapes to suit various locations, e.g.
panga that evolved in Africa and
bolo in the Philippines (see similarities of the latter to the khukuri), and we consider these to be types of machetes... but NOT as types of khukuris.
There is no specified thickness of a machete, there is no specified thickness for a khukuri, so why is a "khukuri machete" considered to be a
khukuri-shaped machete?
My theory - the influence of Spanish expansion and trade did not affect India to the same extent as it did other places, indeed it wasn't until the end of the 15th century AD that direct trade links between the West and India were re-established after the Roman collapse! So while the "machete" (or some form of it) had been carried and developed by various peoples all over the West for a millenium, the oldest known Nepalese khukuri dates from AFTER the re-establishment of trade with the West. Why oh why are there no
earlier Nepalese examples? The reason that the kukri-machete is a machete and
not a khukuri is because the machete is a more well established tool in the known world, its features more recognizable despite its various forms, whereas the traditional khukuri has not been known to the world for nearly as long and has not evolved into as many forms that differ substantially from the traditional form constructed thicker (and so heavier) than the best known forms of the machete. For how long have the people of Nepal known how to construct such a long & thin yet durable cutting tool? Would they have done so already had the exchange of ideas been more prevalent throughout history? If they had done so, my guess is that we STILL would call these "kukri-machetes" just as we use the terms "bolo-machete" and "panga-machete" to describe different blade styles.
So to my mind, these machetes are effectively thin, non-traditional khukuris. And I bet you can find machetes in Nepal today
