What's your control group for a study that might confidently determine that one way or another? Where are food-plastics held off but everything else about modernity and its potential blights adopted?
Ultimately, there are numerous terrible trends in health and wellness that we see accumulate over the course of the 20th century, consistently echoed in developing communities as they join into modern practices. Some causes of death go way down, some experience of luxury goes way up, but misery and previously uncommon forms chronic illness seem sweep across each and every such community.
We don't have a good, scientific handle on what the specific causes are because there are so many simultaneous radical changes that are introduced into a community as it "modernizes", and while we can sort of flail about and speculate about individual mechanisms and test them individually, as in this study, it's consistently a limited and almost blind search among the innumerable unknown unknowns that we don't have the capability, finances, or will to explore at population scale or over decades-long periods of time.
We'll presumably catch up on some of our horrifically dumb mistakes, as the GP noted for things like asbestos, and plastics may or may not prove to be among them, but right now we mostly just know that we face huge new problems and most of us will probably be gone by the time society learns what it did to cause many of them.
