The person who named the file made a typo or copy-paste error, grabbing "FHD" from a different release. The real resolution inside is 480p.
The uploader has used "FHD" as a buzzword to attract clicks, but the actual resolution is 480p. This is a common trick on piracy sites. The file is low quality, blurry on modern screens, but labeled "FHD" to mislead. -Anime4up.rest- M2099 EP 07 FHD -480p-.mp4
Find the episode from an official streaming service (Crunchyroll, Netflix, Funimation) where you'll get true 1080p or 4K, clean audio, and no malware risk. The person who named the file made a
The video is encoded at 1080p resolution, but the bitrate is so abysmally low (e.g., 300 kbps) that the actual visible quality is equivalent to 480p. In other words, it's a large file size (because of 1080p frame size) with no detail – the worst of both worlds. This is a common trick on piracy sites