You mean for the swords one?
I suppose I could write a response article, but I don't think that my credentials boiling down to 'amateur wannabe historian who only researched katanas to make a Skyrim mod' are all that much better than 'guy who knows an amateur swordsmith'. At the end of the day, I'd rather anyone serious about it didn't just take their facts from me either, but do their own research.
Plus, it seems kinda pointless, since their basic conclusion that katanas are structurally weaker than a European longsword is correct. It's just that every single argument they used to that end is wrong. So it's kinda being right for the wrong reasons.
That said, though, a lot of katana reproductions people buy or which are used in comparisons (like the awful one on Lock And Load) ARE tempered steel, rather than traditionally built. Basically they're more of a shingunto reproduction. (Ironically, the super-katanas people claim the allies encountered in the pacific, the ones that supposedly cut through machinegun barrels, would also be shingunto, which was the standard army sword at that point, not traditional family swords.) You can tell those by their having no hamon (that white wavy part near the edge), or a fake hamon done by chemical etching or just rougher polishing there. So far I only seen one TV station which actually had an expensive katana traditionally forged just so they can destroy it in their test, the rest go with the cheaper reproductions.
Ironically, though, those crap reproductions are FAR harder to damage than the real thing, and can be used to show stuff like poking through a steel breastplate with a katana or whacking cluelessly at a metal breastplate with it, without risking shattering the crystalline martensitic structure at the edge.
So the fanboys who think that katanas were awesomely strong and flexible and whatnot... might actually own one that is, if they bought a cheap replica
