Oh god...that guy again. I personally don't listen to a word he says, since I've come to the conclusion that he knows nothing I find useful about knives. Given my experience with the Blurs (3 CF154, 1 SPRGRN, 2 S30V, 5 standards), I've never come across one that had lock slip, and I've checked all but one of them (a CF Blur that hasn't left the box more than once). Not a bit of movement, and certainly never a failure.
While I don't think he's being intentionally disingenuous, I do think he's not a particularly smart "user" of knives. He's shown that in other videos I've been shown of his. If I were to guess, considering that lock is slipping on both of his knives, he could have inadvertently oiled the pivots and contaminated the lock face. He also could have gotten lemons. I don't know since I can't handle those, and I'm only hazarding guesses. I'm sure he doesn't realize that he's either foolish with his knives or may have bad luck.
His conclusion is that the Kershaw Blur is not a safe knife. I don't think that's an intelligent conclusion, and I don't think that his title of "Cut My Pinky Off!" is an intelligent one. I used to subscribe to him until I started getting the very clear impression that he's (to put it at its mildest) not a very intelligent knife user.