This indicates the source was a Digital Cinema Package , the industry-standard format used by commercial theaters. This implies a higher bitrate source than a standard consumer disc.
The Evolution of Pandora: A 4K Deep Dive into the 2021 "Avatar" Remaster When James Cameron’s avatar20094kdcp2160px264dtshdpoop 2021
Summary
Avatar was re-released in theaters in (in 4K HDR) to promote the then-upcoming sequel Avatar: The Way of Water . During that window, pirate interest surged. Many users searched for “Avatar 2009 4K DCP” hoping for a true theatrical-quality rip. Scammers and memers alike responded: This indicates the source was a Digital Cinema
: James Cameron remastered the original film in 4K with High Dynamic Range (HDR) for its 2022 theatrical re-release. During that window, pirate interest surged
Below is a written from a tech/enthusiast perspective, assuming you want to discuss that particular release quality or the state of 4K fan encodes in 2021.
Avatar remastered (blu ray 4k versio) has the extended version?