WEB-DL 2021" refers to a specific of the 2017 Michael Bay film that likely became available or was updated on streaming platforms like Prime Video or Netflix in 2021 . Movie Background
In the world of digital media, a "WEB-DL" is a file losslessly ripped from a streaming service (like Netflix, Amazon, or Vudu). The 2021 date likely refers to a newer 4K UHD HDR Dolby Vision