Allowing Milchig (dairy) products that they certify to be labeled NON-DAIRY in big bold letters is a serious offense: “Lifnei Iver Lo Sitain Michshol” (It is forbidden to cause another Jew to sin)!
Someone may consume these during a Fleishig (meat) meal!
The fact that in smaller print they say OU-D or dairy is not a reliable solution.
It should be. NON-DAIRY, no matter how big and bold the letters, does not mean kosher. So the consumer needs to check for a hechsher, and when he finds one, it’s got a D next to it.
Not a valid complaint.