A "standing shoulder lock" is different from what he was demonstrating. He was using the "double wrist lock" as a bone breaker, and saying how ineffective a shoulder lock is. Youd have to be delusional to think you wont get your back taken, or be taken down when you try to apply that.
Spoken like someone who's never felt it -- and who doesn't even understand what it is he's attempting to criticize.
The standing double wrist lock is, as Tony makes clear (well, at least, I thought he did; but evidently, saying it explicitly STILL won't work for some people), a COMPOUND LOCK.
He doesn't say, as our poor benighted critic here would have you believe, that it is ineffective as a shoulder lock. On the contrary, it's very effective as a shoulder lock if done properly.
What he says is that the FIRST PART of the move is a forearm break. And I can tell you from experience that when this is applied, the LAST THING you're thinking is "I'll take his back."
For one thing, your arm is twisted and you are not in any position to come around for the back (the arm twist is what moves the opponent so that he can't square up, can't bar arm, can't reach through, etc). You are in a wholly unnatural position. For another, the same kind of bone on bone pain you get from, say, a shin lock, is the kind you experience here on the forearm.
The SECOND part of the compound move is to attack the shoulder. Should you want to or need to. What Tony DOES say in the clip is that when he applies the lock he oftentimes doesn't have to worry about the shoulder, because it's enough to use the forearm pain as either a come along, or, if he needs to, he can hook the guy -- that is, snap the forearm.
Again, until this has been applied to you with that twist and the bone on bone pressure on the forearm, you have no idea how painful it is. This is NOT a standard standing Kimura.
But whatever. At least you linked the video, so people can decide for themselves.
While you're at it, though, you may as well have linked the counter:
YouTube - Tony Cecchine's American Catch Wrestling: standing double wristlock counter