Like I said, not detracting from the sword, Its definately VERY good steel (Watched the whole video) cause on the close ups at the end you can see the blade, and more precisely, the edge, didnt fold or lose shape. So, its definately good steel, but I'd like to see how well it held up to a Claymore wielded by a pissed of drunk Scotsman.
Think of it like this.
Pop can = bullet
Table knife = sword
pop can vs pop can. (bullet vs bullet) and with even moderate force, they both essentially destroy each other. Both will shows marks from a head on confrontation.
Pop can vs Table knife. (bullet vs sword) The table knife wins every time. You can stab and chop and swing all you want, but you wont really do much aside from mar the finish on the table knife, because the pop can is just so much softer. Same with a sword vs bullet
table knife vs table knife. (sword vs sword) This is where you find the true mark of a blade. Countering an equally hard object with another equally hard object, especially if weilded with much force, you'll soon see which one really has the extra degree of quality. The lesser will lose shape and dull quickly, the higher quality one will hold its shape and edge longer and through more forceful blows. A true test of edge IMO is to use another quality sword, give it to two people and have them try to kill each other for 5 minutes. Then see which edge is still the sharpest with the least deformation. So, think of two swords slamming into each other, edge vs edge. Both are very hard. But, SOMETHING has to give. It might be the edge, it might be the blade or it might be the other guys balance as he backpedals to recover from the force. But, if you can repeatedly do this and the edge holds strong, you have a GOOD sword.
A disclaimer though, hardness and brittleness go hand in hand with steel (usually) Thats why I'm not saying the sword is any less in quality. While the bullet may be soft and easily cut by the hardest of materials, a brittle material would shatter from the shock. Think if that sword was glass? The bullet would shatter it to peices. So, the sword has to have both hardness to hold and edge and remain sharp, but also be soft enough to absorb impacts and flex so as to not shatter. With heat treating, tempering and proper forge work you can actually make blades that have bands and layers of varying degrees of softness and by mixing them get a best of both worlds as it were, having a blade thats both very hard and able to absorb impact.
But, thats why this test doesnt weigh too heavily with me. The bullet is just too soft. Go blow for blow with another peice of steel, THEN let me see the edge. If it can hold up to another steel blade, then you have a fine weapon.