Kinda like two bad storms in the Gulf....suggest....the result of Climate chnage.
The use of the word ‘suggests’ shows there isn’t a false claim of absolute knowledge, and is consistent with the scientific method.
Climate change is 100% natural, 100% of the time.
This kind of discovery is particularly interesting. Metalworking on this level was a highly skilled craft. Technical knowledge like that would diffuse across space & time slowly and in fits & starts.
"Suggestion" is the proper motive of an inductive argument, whereas "proof" is proper to essentially deductive arguments. The author is just qualifying his direction to conclusion.