I genuinely can‘t tell if I‘m seeing something different to everyone else here… what it looks like to me is:
Ocon uses his normal racing line and brake marker on the approach to T1. Literally no different to his previous laps, judging by F1TV.
Hamilton goes for a lunge just as the gap between Ocon‘s car and the barrier starts to reach towards its narrowest point due to the angle of the right-hand side of the pit exit coming towards Ocon‘s racing line.
In no way does Ocon do anything different to before. He doesn‘t brake any earlier than on any of the previous laps and he doesn‘t take a different line. He doesn’t steer to take space away from Hamilton, either. The only thing that‘s different is Hamilton‘s lunge, which comes just as Ocon lifts off the throttle going under the TAG Heuer sign. By that point, Ocon’s committed to his line into T1 as Hamilton rapidly comes up to his right rear tyre, seeking space with his massive overspeed where there obviously isn‘t going to be any.
I don‘t see that as a penalty-worthy action from Ocon at all.
(As a sidenote, I feel the debate around this incident here and elsewhere would have greatly benefitted from either the availability of Hamilton’s or Ocon‘s forward-facing camera. Alas…)
After initially seeing the clip I thought it seemed like a clear mistake from Ocon. Hamilton dives up the inside and Ocon shuffles him into the wall. However...
...on turning up the sound on the clip you can hear that, like you say, Ocon has already lifted the throttle and is starting to brake on the normal racing line before Hamilton is alongside. Effectively, Hamilton is diving into a narrowing space with respect to the racing line after Ocon has already started braking. The only thing Ocon can do to avoid contact is to move under braking.
Also, I agree that more than one angle of this would really help.