Likely the name of a specific "release group," a team responsible for encoding or distributing the file online.
The video compression standard (also known as AVC) used to deliver high-quality video at lower bitrates.
While the film was released in 2023, 2021 was the year production officially began in London, Bulgaria, and Greece. About the Movie: Expend4bles (2023)
A file sourced directly from a streaming service (like Netflix or Vudu ) without being re-encoded, preserving high quality.