Some people worry about everything. For example the article talked about chromium being a good thing but in fact there are forms that are carcinogenic. Stainless also often has other trace elements. All comes down to details and what you care about and article does not really address any of that. They even suggest damaged cookware is somehow worse when stainless is self healing. Seems more of an ad then real information.

For me it all comes down to stability. Glass is probably the best, stainless next best just in terms of stability and melting points etc. On the other hand plastic, Teflon, and aluminum… this stuff has a lot lower melting point and a lot of of it has lot less stability. There is a question about contact time too. If your worried about this maybe it is better not to store stuff in plastic for example especially wet or liquids that have a lot of intimate contact. Or better not to microwave stuff in plastic.

It is all a trade off. Personally for me I prefer glass or stainless myself.