Pretty much all such claims can be easily dismissed by pointing out that such advances

1. Can obviously be made

2. Can be made very fast

There is simply no reason why major advancements in metallurgy couldn't have been made between 4453 and 4382BC, completely unknown to us, and later forgotten.

If fact, it's a mystery why we can't see more of such ancient artifacts, if anything.

The article doesn't even go far enough by blaming the oiling on some accidental dumb ritual, while it used to be common knowledge that iron can be protected from rusting by oiling it, and it was done completely on purpose.