I'm no expert, but having read some archeological papers that do make conclusions like that, the evidence is often quite compelling and well-supported. The context we find something in can convey a lot of data, and conclusions that aren't supported by the evidence are frequently argued against by other archeologists. Granted, if you only read the university press releases or the popular summaries thereof it can be somewhat misleading, but that's more down to the journalism than the research.

Yeah it's so ridiculous when people use spectral lines to say they know the chemical composition of some distant star. Obvious bullshit. The idea that anybody could infer this sort of thing from such scant evidence is just academics making things up. The laypeople know better.

/s