its believable in my opinion. canon tend to decrease the readout speed make it slower depending on frame rate . so 4K60 probably have better rolling shutter than 4K30.Shame about the overheating, Canon should have done a better job there. But i'm not sure i believe the "horrendous" rolling shutter when the 1DX3 sensor is one of the best on the market and barely has rolling shutter.
I think they, EOSHD, are asking exactly the questions I did in the post above.This put some light on this, and points to the whole video being a set-up. He won't even say for how long he actually recorded before the overheating.
Highly contradictory reviews on EOS R6 overheating limitations - EOSHD.com - Filmmaking Gear and Camera ReviewsJust when you thought the Canon EOS R5 overheating drama had been swept under the rug, the EOS R6 runs to pick up the baton. But this time, not everybody can agree on what it’s good for. These Canon articles write themselves really. If ever they could show you two products that justify my...www.eoshd.com