It isn't. Anglo-saxon traditions are focused on the cyclical nature of the year, and there's no particular need to mark what year it is. There's no evidence of any sort of year marking that I can find in anglo-saxon traditions. Modern pagans just use the modern Gregorian calendar. Just many mark the metaphorical passing of the year on a different date.
Also different types of paganism have been around for different time periods. The winter celebration of Yule/Solstice is mostly universal in anglo-saxon root pagan groups, but there's a lot of those with no one unified church, and they all practice traditions from somewhat different time periods, regions and with different levels of historical accuracy. For example Celtic reconstructionists celebrate the passing of the new year on Samhain - Halloween. Those who celebrate proto-germanic or Norse paganism celebrate the new year on Yule. Modern anglo-saxon root pagans have mixed practices and chose one or the other based on what they feel best fits their practice. There's so much cross pollination between the anglo saxon traditions it's hard to see where one ends and another starts. It would be impossible to count. It's a fluid experience, both historically and in modern practice.
It's worth noting that there's other pagan midwinter/december traditions - like Haola and Saturnalia - that are celebrated still that aren't anglo-saxon as well. They may have their own calendars. And many people lump native traditions and diasporic practices like voodoo in with paganism and they may or may not have their own calendars as well.
here is their Instagram too and I think they have a FB page too but idk.
