This states Nikon Japan and i think it should say free repairs, to be fair they have supported the repairs for a long time.
https://nikonrumors.com/2019/07/10/nikon-to-end-d600-sensor-repairs-on-january-10-2020.aspx/
https://nikonrumors.com/2019/07/10/nikon-to-end-d600-sensor-repairs-on-january-10-2020.aspx/