If he would of put any right at all, he would of lost position. Here's a challenge for you. Since in the last month myself I have made pretty much that exact same shot, and a few others with the same aim->deflection approach. Set up that exact same shot, see if you can execute it like he did. Don't care about your approach, just want to see you control the cue ball like that. You say you have the theory why, but maybe not the skills. Well enough tries and you should get the understanding of the shot. At first you'll be losing the cue ball long on position for the two, if not leaving the cue ball on the rail or worse. Having it come back off the second rail for a safe. You'll probably try put some left on it, and miss the ball completely. Few tries later you'll probably make the ball again and come closer to position. But nothing like Yu Lung gets. That's because it's just BHE on a jump to apply the left, which essentially steers the cue ball through the jump. Which is why it looks so odd from above.
He's stroking through the left of the ball, not [striking left like you are assuming. There's a difference, and it's not just a subtle difference either. It's massive. Changes your perception of what a jump shot really is. Maybe you've already grasped the difference of the stroking and striking for jumps, but 99% of people who jump will never understand.
Cheng Yu Lung pushed to that position to jump from intentionally. SVB looked it over, and knowing the risks of trying to hold position, weighed the chances of CYL to hold for the two and chose wrong. SVB would end up doing almost the exact same thing as CYL I bet, and you'd be sitting here scratching your head about the shot still too. No matter how you want to justify it yourself JB, Cheng Yu Lung put left on the cue ball, and the cue ball did not deflect to the right.