Headline is a bit misleading because the link to the volcanic eruption is not definitive and it may have been a celebration of the return of the sun rather than a sacrifice, but the article itself is interesting. A major change in the climate would certainly explain such a dramatic shift in their culture.
Ordinarily I hate it when archaeologists try to apply meaning to something they found, because they often state plausible theories as if they are facts.
This theory seems to be pretty sound though, looking at the evidence they’ve provided.