After 'Oppenheimer,' the big-screen company designed new cameras and production tech to allow Nolan to shoot in Imax, on film, end-to-end in his upcoming epic, and not just for select sequences.
I recently learned that IMAX film cameras are as loud as a lawnmower. That still doesn't explain why Nolan's films have such wretched sound balancing lately.
They list F1 as entirely on IMAX digital, but that's not true because it will include footage filmed during actual F1 races onboard. They're the highest resolution cameras used in a car to date, but they're not IMAX. So it looks like the term "entirely" can be flexible.