@mitneb thanks for the help glad to see you like my post. It is a really old cookbook, to be honest :) and yes archaeology is a science evolving with new knowledge. For sure ideas and interpretation changes with new discoveries, archeologist try to piece together the past of humans with help of artifacts. One must bear in mind that the past is long gone and forgotten so in some cases it is difficult to elaborate. And yes a lot has been misinterpreted.
I do not dive, I am more active on land, field archaeology is more my thing :D