No they have offered a re-usable item made from plastic. They will probably last me years, possibly decades.
It is the one-use plastics that are the problem. Not all plastics, I have plastic items in my home, that I have owned for decades, boxes, buckets, bowls, kitchen tools. Do not demonise all plastics because one type causes very serious and dangerous damage to the world.
Namsnanny in principle you are right, plastic is made from gydrocarbon feedstock, but it then has all kinds of other chemicals added to it, to make it hard/pliable/to colour it and these additions, when incinerated can cause harmful chemicals and particulates to enter the atmosphere.
However approriately designed facilities with the right filters can remove them. I think the answer is go back to the start with the manufacture to try to find materials that can be added to the plastic base material to get the required quality in the products that are not contaminating when burnt.