I've seen this. It's pretty crazy, but I doubt it was a standard technique in battle. For one thing, he's using a bow with between 30 and 35lbs. of draw, which is several times weaker than your average war bow. Most of the bows on the
Mary Rose were well over 100lbs. in draw weight. And shooting this way would exhaust both you and your quiver in under a minute, not a good thing on the battlefield.
The mail used in the test could not possibly be accurate, as properly-made mail can easily resist most attacks with swords, spears, and arrows.
This article by Dan Howard gives a good overview of mail. I find that armor is much more misunderstood by most people than archery; in movies, armor almost never protects the wearer at all, and many believe that knights could barely move in their armor and needed cranes to lift them onto their horses, which is
completely untrue.
Finally, English war archery wasn't like this. Their archers shot in massed volleys at fairly long range with very heavy bows rather than rapidly at close range with weak bows. And at Agincourt and Crecy, English archery doesn't seem to have killed too many men; at Agincourt, the French knights were superbly armored (though many non-knights were not), so the bulk of those killed or maimed by arrows seem to have been horses. The French, however, had to slog through a quagmire before meeting the English lines; the exhausted French suffered many losses in the melee, and thousands were taken prisoner only to be executed. At Crecy, the English had the high ground and the sun to their backs. The French deployed their Genoese crossbowmen, but they had left their pavises behind, and after suffering from English archery from their superb position, the Genoese pulled back. The enraged French saw this as cowardice and charged through their own crossbowmen, killing many in the process and causing chaos. The English had little difficulty winning as a result of poor French leadership and an excellent position, not because their bows were effective against plate armor (they really weren't). Most "tests" of the English bows have been at almost point-blank range against a firmly secured slab of steel plate that is not of armor quality or shape, and has no padding behind it; mail and plate usually, if not always, had layers of padding to absorb blows.