Did you read the whole article? They followed up by exposing kidney cells to the extracted micro and nanoplastics and they caused significant amounts of cell death. There is definite evidence that something in these plastics is causing harm, and more study is definitely warranted.
What do you mean by “better off”?
I guess it would have the same nutritional value, but that’s not really why you drink milk. Like, I could eat peanuts, grapes, and bread for a healthy meal, but I’d much rather have a PB&J (probably with a creamy glass of oat milk).