As little standardization as there is with RC electric components what is there provides a fair depiction of what the seller says their product will do. A very large caveat comes in trusting those values to be factual. Typically they use a constant voltage, and your chart goes a step beyond in showing a decreasing voltage, which is what we experience with battery power supplies. I'd assume a 100% throttle position with that chart to be safe. You're on your own with any lessor throttle position.
Such charts are fair starting points but failure to perform your own prop, motor ESC, battery thrust testing can put you at high risk. Unfortunately that means one has to buy more than they should have to obtain the system they need to have. A word of caution borne of experience; never, ever trust a power chart of Chinese origin to be more than 80% factual. They are what I'll call "optimistic" for the sake of avoiding future argument.