The original story was similar: PLA is made from corn, and is completely biodegradable.
Interested people took various parts made from PLA and put them outside for a while. Some people buried them. Some people put them in their compost pile or canisters. I think the only result was some discoloration and possibly some reduced strength.
So now it seems PLA only biodegrades under industrial conditions, requiring elevated temperatures.
Remember all the hysteria over “death panels” during the ACA debates? Fooled you, they were already here, invented by insurance companies.