Just based on the historical accounts mentioned, it seems more likely that the tools described/used were actually feces knife that have a layer of ice on the ou

Just based on the historical accounts mentioned, it seems more likely that the tools described/used were actually feces knife that have a layer of ice on the outside- which could arguably cut without having the melted skid marks problem described by the anthropologist. If this were mythbusters, I'd call this experiment inconclusive.