It is confirmed. There's video evidence https://www.youtube.com/watch?v=34MU23ZOyZA

I'm don't think he synch the videos correctly. I know he said he did. But he dlesnt synch them when his shield drops to 0. He synch them when they kneel I know he said he does it with the shield. But he really doesn't. I just spent the last 15 minutes re watching the clips and I'm 100% sure the clips on the left always take the shield down that .5 seconds. If you don't believe me. Check it out for yourself and stop it frame by frame. You'll definitely see it. It's just that crota moves and his "moving animation" has to finish before his "kneeling animation" starts. But you can still attack him as the "moving animation" is ending because technically. His shields are down. And he also proves that when he shows the sword bearer point of view. You can see this because by them time crotas knee hits the floor. The left has one hit. While the right clip has 2. Now time for a third or fourth hit doesn't matter here because the knee hits the floor at the same time. Meaning it could only be the damage before that. Meaning he could only do more damage because he managed to hit crota while he ended his "moving animation". Again. Showing that the videos aren't synch to crotas shield. But. Just watch the video frame by frame. You'll see yourself.