"archaeologists believe that the mound's creation could have been influenced by two different astronomical events: the light from the supernova that created the Crab Nebula"

That's a pretty dubious assertion (and I notice that there aren't any references to which archaeologists supposedly believe this), since:

a) I'm pretty sure there aren't any examples of buildings or structures being "influenced" by this or any other historical supernova in any other cultures; and

b) No mention of the supernova of 1006, which was brighter and longer-lasting than the supernova of 1054?