On a different thread NC wrote
“On a side note, what she said about cold dishes is correct. I think there’s a tendency of some MO people to eat even hot food off of treif utensils if the food itself is kosher (not saying this is mainstream). I don’t want to derail this thread too much though.”
http://www.theyeshivaworld.com/coffeeroom/topic/rumor-about-ivanka-trump/page/2/#post-1299628
I do want to point out. (though not there since it is well off topic) That there isnt technically anything wrong with eating cold food on treif dishes
Furthermore, strictly speaking even a Goy cooking Kosher food in trefi keilim that are eino ben yomo (and a “Stam kli” is eino ben yomo) isnt assur as there is no gezeira of eino ben yomo uto ben yomo for a Goy.
However R’ Moshe in a teshuva established kashrus policy adhered to by all major hashgachos not to certify such a situation as it is “mechuar hadavar”