God as a chemist and regulator I’m so sick of seeing news stories like this trying to scare people. Metals are in everything - there’s metals in the food you eat even if it is a natural product. Regulations allow trace amounts of these substances in products as it’s almost impossible to remove them completely and trace amounts are not a safety concern, it even says in the study that they are unclear on effects on safety.
Regulations for tampons mean companies must ensure the product is safe before it is sold, they also must consider where the product is being used (eg. In the vagina) when doing safety assessments. The concentration of trace substances allowed in products will differ between foods & cosmetics for example, because one you are consuming and one is typically only applied to skin and not absorbed (it goes into much more detail than that though).
This article is not news at all and is extremely irresponsible!