Technically, water can still go higher than 100°C, same as humans can go higher than 100°F. Water turns into steam. If the temperature continues to rise, the steam would theoretically enter a plasma state. Then, you could say the water has "died" as the atoms and molecules lose their electrons.

Humans can survive 100 F so it’s not a scale of 0-100, which you would expect for a system based on humans

No one said it's a scale limited from 0 to 100 on the basis of survivability. That's something you just made up on the spot to push some weird narrative.

The person I responded to said it was based off humans, I was arguing that it wasn’t because no patterns exist in relation to humans

I again have no idea what you're saying. The patterns of 0 being low and 100 being high isn't a pattern related to humans? That's obviously not true. We use 0 as the bottom and 100 for the top on a lot of other things.

Well the person claimed it’s based on the temperature of water at sea level with 0 being freezing and 100 being boiling. This would be the 0-100% for water

Why are you limiting 0 and 100 as cut offs?