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.
Its actually just an average temperature. When you set the oven to say 350, both the Bake Element at full power (220 volts) & the Broil Element at half power (110 volts, not all ranges use the broil element but most do) or if a gas range the oven burner comes on and starts to heat the oven to the desired temperature.