On the #800 x 5, it looks like some are breaking parallel, some aren't. Doesn't matter much at they're gym lifts. Also the backview and shorts don't help to judge depth, as much a side view.
Here's the #905 that got called for racking too fast -
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Looks like he gets it nicely, in competition, there just needs to be a slight breaking of parallel. Just a bit of the top of thigh must be below the knee, no need to go deeper.
A side view is the best view, but is hard to get and doesn't make a nice video.