My theory is that it covers dash cam recordings (video and/or audio). Some dash cameras point backwards from the back mirror, so they get a partial view from inside the car. Everyone’s assuming that Nissan is intending to collect this info, but their EULA might merely be a side-effect of dash cam data being available to technicians when they work on the car (e.g. fixing the dash cam).
Good point but you are forgetting the first rule of the enshitification: “Never attribute to common sense and decency what could be attributed to inhuman levels of greed”
They may have put that in for technicians but data is money, if they can legally acquire yours they already are.