This graph assumes the fluid is at the temperature indicate by the x axis already before adding the additional heat. So in the process you must include the energy needed to get to that temperature.
Also, 650 K is 377C or 710F; way higher than 210F for sea level boiling.
There are no free lunches in physics.
“This graph assumes the fluid is at the temperature indicate by the x axis already before adding the additional heat.”
It doesn’t assume. It gives you the value at any temperature.
“So in the process you must include the energy needed to get to that temperature.”
Or remove energy to cool it down.
“Also, 650 K is 377C or 710F; way higher than 210F for sea level boiling.”
Your point?