The "2021" tag often pops up because that was the year the manga received its definitive English publication 1.4.9 . If you are looking for the "uncensored" version, this was the era where high-quality, official translations finally made the full, unedited vision of the creator accessible to Western audiences. Where to Find It
The narrative is deliberately paced, allowing the audience to soak in the details of everyday life while hinting at larger arcs to be explored in later episodes. tsf monogatari episode 1 uncensored 2021