One of the factors to consider in the formulation of a color film is how it records skin tones. If it is to be sold in Europe or North America when most of the subjects are Caucasian the film will be made one way. In other markets, like India, the film is made differently to record the darker skin tones there. I just so happens that it is also warmer where the skin tone are darker. So the warm temperature storage story may also be coupled with a different way of rendering skin tones and other colors and harsh light. Just my theory.

Also as far as I know Kodak has stopped selling Gold 100 in the USA. So the only "Gold 100" you can buy is grey market stuff.