The article is all gushy and starry eyed about the "printed circuits" and how durable they might be. The metal ink used to print them melts at 140˚F. Your car in the summer can reach 200˚F.

So they're all great and durable until you leave them in your car. Or too close to your oven. Or on top of the coffee maker.

The article quoted Celsius scale temperatures.

140˚C is 284˚F. At that temperature, the fact that the ink is melting would be the least of my concern if this is intended for wearable electronics.

maybe they'll be some kind of coolant to apply, perhaps a type of thin silicone lamination.