Yes. On a practical level for the example you show above, the injector remains mostly linear down to about 7mg/shot. Since this is well below our minimum steady state fuel mass at idle or cruise, errors in the even smaller pulse widths become less relevant.
On the other hand, I have tested injectors from other sellers who provided "data" on them that varied by as much as 40% at the idle fuel mass! That's not to say everyone else's measurements are bad. When I measured Injector Dynamics units, I got within 2% of the rating across the board.