They're confusing it with a 35 C wet bulb temperature. 35 C dry bulb temperature would only equal 35 C wet bulb temperature at 100% RH.

You can convert with a psychrometric chart [1] or with a calculator [2]. At sea level, 35 C dry bulb, 80% humidity is about 32 C wet bulb. Dangerously hot, yes, but it won't kill you in 15 minutes.

[1] https://upload.wikimedia.org/wikipedia/commons/9/9d/Psychrom...

[2] https://www.omnicalculator.com/physics/wet-bulb

It's the wet bulb thermometer reading (temperature read by a thermometer covered in water-soaked cloth over which air is passed). At 35°C it is considered lethal for humans after a couple of hours.

> Wet bulb thermometer readings are significantly lower than the more familiar dry bulb readings, which do not take humidity into account. Researchers say that at a wet bulb reading of 35C, the body can no longer cool itself by sweating and such a temperature can be fatal in a few hours, even to the fittest people.

https://www.telegraph.co.uk/global-health/climate-and-people...