16 segment display datasheet interpretation
There indeed are two connections to the common anode and there is no decimal point LED fitted. 

They would do that because that's what their major customers want (perhaps it is compatible with a previous design by another company). 

The decimal point light pipe is in the molding because molds are expensive and it costs almost nothing to provide for it. They can make a different internal PCB if they want to provide the decimal point LED.