I am having the same issue. There is no reason that it is a Nikon issue. My D850, a different camera to the OP, has always locked certain files which could be unlocked with the get info tool in mac OS. The camera has not had a firmware update and I am using a memory card that was new-formatted since the upgrade to Ventura
The file is read only and permissions cannot be changed. I am the owner and creator of the file and I am the administrator of the mac.
This is an issue that has only appeared since yesterday's upgrade (yes I was a bit late).
It seems that the SD card has custom permissions. I cannot delete (move to trash) the file. However I can overwrite the file - copied to desktop, unlocked and copied back to the SD card.
This has allowed me to continue without going to the camera to unlock the file. However changing permissions would be a much better way to go. The card's permissions are not changeable, I don't know why. They are set to custom. Possibly because it was Nikon formatted?
Maybe the extra info will point someone in the direction of an answer.