It is obvious that since it has rail-to-rail inputs and outputs that the graph is wrong.
The graph shows a single-polarity Vs from +1V to +6V but shows inputs between -3V (IMPOSSIBLE) to +3V instead of correctly showing inputs from 0V to +6V.
6V is the total supply voltage.
I guess (for the common mode voltage chart) it is symmetrically applied, thus -3V and +3V.
And the same ist the common mode voltage range.
The only error in datasheet figure 13 is that it's displaying CM range for dual supply voltage although all datasheet tables are exclusively using single supply. Nevertheless it's just illustrating the simple statement "common mode range Vee to Vcc" respectively "rail-to-rail input voltage range".