[zkelvin]

No, it wouldn't.

Health benefits from dry sauna start at a minimum of around 170ºF, but more typically at 180ºF, and often up to 195ºF. A "slightly too hot bath" would be around maybe 110ºF. Water at 170ºF would scald you within seconds.

Infrared sauna typically heats up to 150ºF, but this heats you from the inside, and so has a similar efficacy to 180ºF dry sauna.

[zamadatix]

The question is "did it trigger hyperthermia" not "was the thing that caused hyperthermia 170 degrees". A bath does not need to be anywhere near 170 degrees to trigger the same level of hyperthermia since it is able to store and deliver heat much more efficiently than air (hence why 170 degree water would severely burn you).

Remember your core body temperature need only change a degree or two to trigger strong responses from the body. After about 5 degrees you're into hyperpyrexia which is life threating.