Is sitting in some shade for a few minutes every so often stopping that? Asking for real I’m not a doctor.
Fluids are the most important thing. And you definitely lose more faster sitting in the sun than the shade.
I'm being a little over dramatic with the death stat as players are probably safe from that just by the natural breaks of offense/defense in a game versus the continuous early season conditioning. But the increased risks of dehydration, cramping, rhabdo, and kidney damage are very real. And there's several studies showing concussion recovery is worse when a player's core temperature is elevated.
It's apples versus oranges comparing it to the cold. Most athletes should still be performing at a high level in the heat versus the effects of the cold. I doubt it had much effect on the outcome of the game. It's just that things can change very quickly in the heat and in my view this should be considered a player safety issue.