Each brand is trying to find a way to get a leg up on the competition in a tight market space. The above picture is what I found on my last grocery run. What caught my eye was the asterisk next to the non-GMO popcorn claim. My guess was the ingredients list would include soybean, canola, or corn oil.
The temperature for broiling in an oven is 260 degrees Celsius or  500 degrees Fahrenheit. Medium heat is about 177 degrees Celsius or  350 degrees Fahrenheit.
Place on a broiler pan or other oven-safe pan. Broil about 8 inches under the flame for approximately 6-7 minutes per side for medium rare - an internal temp of 130 degrees F. Transfer to a plate and cover loosely with foil; let rest for 10 minutes. To serve, cut against the grain into very thin slices.