It looks like around £5k per year needs to be budgeted for maintenance and tyres.
I've got a 2016 model and owned it since 2020 and I've never spent that much. Though it's going to depend on how many miles you do and where you get it serviced.
Granted, I'm low mileage (I've done around 11 to 12 thousand miles since I got it).
I had been using Nissan and servicing rates cost from ~£600 for minor service to ~£1200 for a major (IIRC). Not going into the details just now, but I had issues over the quality of work Nissan did, so I'd recommend finding a good specialist to service the car and they will be cheaper than nissan.
For tyres, it cost me £1250 for a full set of Pilot Sports 4S ( I think that was around the end of 2023)
Over time I've had brakes replaced (~£2200 for the fronts) and a few other bits but I don't think I've spent more than £3k in a year on maintenance, but again that would be helped by the lower mileage, though I'm not sure how big the difference would be.
As you say, the cars are holding their value pretty well and the fact that Nissan doesn't sell them any more can't hurt. Regardless of that, I love mine!