Normally you would expect an datasheet to indicate wavelength, Vf, If, Luminous Intensity (mcd) etc etc.
Also you would expect the Decimal Point, DP to be small compared to the segment, but not expect 2 diodes shunted by 1.
My guess is the supplier has 2 sources , one with 1 single diode per segment and another with 2 and since Vf is not given, you have to guess. It is normal for digits larger than 1" to have 2, 3, or 4 LEDs in series for the segments and 1 or 2 for the DP and 1 or 2 in series for < 1" in RED 7seg + DP displays.
This drawing is obviously WRONG.
My Guess, all series chips.
Here all they tell you is the pinout and mechanical dimensions of each segment and list it as
"1.2inch 1bit Red digital LED "
Distributor with poor drawing skills has misrepresented the part.
To me it looks like someone with primitive engineering skills made a drawing with 3 LEDs per segment and made it your guess for multiple source.
How desperate are you to buy poorly documented parts?