Then they aren’t headphones, they are earmuffs with noise cancellation.
The insulation in the earmuffs is doing the real work. Noise cancellation by itself isn’t going to protect your ears much at all, if anything.
On a film set I would expect anyone in ear protection like that to use the kind with either external sound amplification (mic on the outside, speaker on the inside, so they are headphones) and/or with wireless audio transmission (bluetooth/etc, speaker on the inside, so still headphones)
Since when is noise-canceling headphones protective gear, lol?!
Since… about a decade ago? Noise cancellation/reduction has been an available feature in earmuffs marketed to firearms users for a while now.
Then they aren’t headphones, they are earmuffs with noise cancellation. The insulation in the earmuffs is doing the real work. Noise cancellation by itself isn’t going to protect your ears much at all, if anything.
On a film set I would expect anyone in ear protection like that to use the kind with either external sound amplification (mic on the outside, speaker on the inside, so they are headphones) and/or with wireless audio transmission (bluetooth/etc, speaker on the inside, so still headphones)
e.g. https://www.amazon.com/PROHEAR-Electronic-Protection-Bluetooth-Amplification/dp/B07YSM7N97
Should still not be called headphones when their primary function is hearing protection.