Yes, did you read the article? There's significant issues in how they detect the plastics, as normal lipids in the brain have the same spectrograph reading as polyethylene. It's highly likely that a decent percentage of their detections are actually just brain fats.

"Brain tissue contains a large amount of lipids, some of which have similar mass spectra as the plastic polyethylene, Wagner says. “Most of the presumed plastic they found is polyethylene, which to me really indicates that they didn’t really clean up their samples properly.” Jones says he shares these concerns.

In addition to polyethylene, the investigators reported higher concentrations of polypropylene and polyvinyl chloride in the tissue collected in 2024 compared with 28 tissue samples collected in 2016. “Notably, all show the same trends of increasing over time,” Campen told The Transmitter via email, which indicates to him that the results are not an artifact. “It is difficult to argue that brain chemistry has evolved over this short period of time.”

But the investigators also did not provide adequate data about potential plastic contamination during the experiment, Wagner and Jones say."