It’s likely they are trying to deflect on a technicality; something like “Medical experts say …[etc etc]… at 108F.”
They tend to do that a lot. Unfortunately that’s probably the heat lethal point; and it can vary a lot based on weight and size; which a doctor or educated practitioner would know; but not an average prison guard, captain or warden who is only intelligent enough to go by what their little book says.
Obviously they are not taught nor instructed to have any compassion whatsoever; and prisoners’ complaints are routinely ignored, intentionally misrouted, mishandled and withheld without good reason.
It’s oftentimes 10x worse in states like Texas…where the usual attitude is to dehumanize prisoners. I genuinely hope they are forced to reform things and stop slacking.