The author is using a variety of examples from ELI5, and goes on to clarify that the answers there are imperfect, debated, discussed, etc.

Why would you conclude that the author thinks this is a good answer vs. just an answer to help the reader understand the subreddit?

With that said, it does tell you something if you’re open to it. To me, it says: “there are a lot of pieces (often literally), and an archaeologist has to put those pieces together”. Is it an oversimplification? Of course. But remember the age the answer is supposed to target.