Don't know that link, but here's my experience with AT Overheat light, a '99:
* had tranny fluid changed by independent shop. I asked and was assured they had the right fluid.
* quite a while later, AT Overheat light came on when I was on the freeway in Montana 20F outside - at 70mph. Owners manual said to keep driving and seek service.
* All this was normal operation, so what was abnormal to cause a warning? I recalled the independent shop tranny service, so took car to Subie dealer for a tranny fluid flush. Overheat light never came on again, a good decade ago. Figured the independent shop used an incorrect tranny fluid.