There are untold additives to plastic, no one knows what was put in what for the most part. There is no reliably removing all of that, even if this outrageous claim of making food out of poison trash was accurate as such.

The additives are the same reason you never want to recycle plastic, it's worse than landfilling it, releasing those additives into the air, and the resulting product is worthless garbage that can't be used for any real useful purpose. It's only a thing because the industrialists fobbed the blame on us for the world they created in the 70's and 80's.