That gave me a chuckle!
Seriously, though, it makes you think about how the line between junk and treasure is pretty thin. In fact ancient garbage dumps are some of the most plum spots to go searching!
I did find that the article made a bit of a stretch, though. While they were invented 50 years ago, virtually every tab we find is more recent than that. I'd date the majority of the ones I've found as 70s and 80s, so 30-40 years old. The criterion you'd use to classify it as an archaeological artefact is the manufacturing date, or perhaps approximately the date it went in the ground. Using another example, bottles were invented aeons ago. That doesn't make a bottle I find buried that someone tossed 15 years ago a historic artefact. Does that make sense?