This reminds me a bit of a private group that did a big study (I thought in SFBA) looking at the amount of microplastics in different stuff, for example delivered food. Just thinking about it because of the startup he mentioned and I was wondering if it was them, but can’t find the article now. I know it was discussed at length here.
I was just going to ask if this was it...
https://www.plasticlist.org/
...and then I saw your link. I'll leave this comment here for the convenience of others.