I would be a lot more worried about the Clinton-Administration DME than the yeast nutrient. The nutrients contain no live elements and are not affected by heat. Most people add their nutrient 10 minutes before flameout (or when you add your DME when brewing up a starter).
You will know in a few days how your DME is going, but I think it will probably be fine as well. It may have some funky, stale flavors, but you are just making a starter. I am sure the yeast will eat it up just fine.