The spec states that the Vf is between 9V and 12V. A single, particular LED from the batch will be in spec if it consumes 1A at some voltage between 9V and 12V. That could be 10.4V, 11.7V... you don't know, and it's going to differ between multiple LEDs in the same batch.
Based on my experience testing several thousand infrared leds of the same part#, where there are 2 connected in series and driven at 100mA, I would in all cases get voltage drop readings within 3.20 to 3.35, (1.60 to 1.68) Vf per LED. This represents about 5% tolerance. You know, the series resistors used in all those circuits had a 5% tolerance, so I really don't know the Vf tolerance of the IR leds, except that they would make rather good 1.7 V zener diodes.
So I'm not convinced that the spec from 9V to 12V is due to differences in the same batch. I believe it has much more to do with LED Dye Material. From the chart, the Vfs are Red 2.0, Green 2.1, Blue 3.8.
From this image 
we can see a 3x3 matrix so it appears that each colour has 3 leds connected in series. If that's the case, now the Vfs become Red 6.0, Green 6.3, Blue 11.4. So this gives a Vf spec of 6V to 11.4V based on dye material alone.