Perhaps this is a case of perspectives, so that the strict acceptation of the Ethnography appears to refer the descriptive study of facts of civilization of the diverse peoples and ethnicities. Everything runs harmoniously on a tacit basis or consensus, until something apparently off scope runs into the club. Scope ... would be precisely the gauge that defines a frontier within which an implement fits into accepted discussion.
It is pertinent to say that Thomas piece doesn't fit in the Miscellania forum, but because its scope comprehending "ethnographic artifacts other than arms and armor" still raises one or another doubt in this case.
Would this be an European item, doubts would not arise, as the scope of such forum makes it clear that replicas or modern items are better dealt in more adequate venues.
So reputing any individual modern creation, providing that it has a blade, as an ethnographic weapon, may be taken by some as a rather subjective interpretation; one that can be validated or rejected by the respective forum moderators, of course. This not meaning that eventual opinions that this is not an ethnographic artifact are not valid, hence risking the whipping post.
And of course this is not about to encourage or discourage those who create whatever they intend; is more about something being or not in the adequate territory.
Mind you, all just impressions of an ignaro
.