: In the context of digital releases, a "PROPER" tag indicates that a previous version of the file had technical flaws (like bad audio or video glitches) and this new version is the corrected, "proper" release. Official High-Quality Options
The text you're referring to appears to be a description for a high-definition video file or digital wallpaper of the anime . 1920x1028 702 Demon Slayer: Kimetsu no Yaiba HD...
'Demon Slayer: Mugen Train' Returns in New 4K Ultra HD Blu-ray Release : In the context of digital releases, a
: The Official Demon Slayer USA website lists Limited Edition Blu-ray sets that provide the anime in native 1920x1080p with high-bitrate video and lossless audio. 1920x1028 702 Demon Slayer: Kimetsu no Yaiba HD...