The article doesn’t give any details to explain why these artifacts indicate continued “paganism” or identify Thetford as a “cult centre.” The only fact mentioned is that the items seem to have stylistic elements that are similar to those of continental European artifacts from a considerable distance. They don’t explain why that is relevant to the “paganism” thesis, rather than simply indicative of long-distance trade in elite artifacts, duh.
Can you imagine finding such beautiful treasures while metal detecting?