From the article - a subcontractor of a subcontractor exported them instead of shredding them. It's at least 3 levels removed from Dow, and likely the Singapore Gov't that did it, as these are Singaporean companies. And they picked them up from the bins, they weren't delivered them by someone else.
What level of diligence should Dow be doing here, especially since the outcome doesn't seem to be a bad one - if anything, a better one?
"None of the 11 pairs of footwear donated by Reuters were turned into exercise paths or kids’ parks in Singapore.
Instead, nearly all the tagged shoes ended up in the hands of Yok Impex Pte Ltd, a Singaporean second-hand goods exporter, according to the trackers and that exporter’s logistics manager. The manager said his firm had been hired by a waste management company involved in the recycling program to retrieve shoes from the donation bins for delivery to that company’s local warehouse."