Not sure what that chart is showing frankly. It's not labeled particularly well. You don't spend flex on a single player for 16 seasons. In fact all flex you would invest in a single player should be spent by the time you are in your 8th season and you boost for the last time(s) to reach level 79.
What dustin said is correct and the OP had the math laid out correctly.
If you play survivor you can use RP's to take the brunt of the Non-refundable points. And when you retire this dot you get 2830 back to use on your next dot.