Mathematically, they are not wrong. An eigth circle is still visually indistinguishible from a true circle (see https://pomax.github.io/bezierinfo/#circles http

Mathematically, they are not wrong. An eigth circle is still visually indistinguishible from a true circle (see https://pomax.github.io/bezierinfo/#circles https://pomax.github.io/bezierinfo/#circles for the proof to back that claim up). Their image, however, shows what happens when you try to only use four, rather than eight, curves: things look clearly wrong (as for how wrong, the aforementioned link gives the error measure. It's _quite_ wrong).