The datasheet said it was low power! It's a 5v native chip. It's got a footprint that I can hand solder. I had some GALs available when I was designing the board.
If the part you have fits the bill, why go out of your way to find a replacement? I get your point. In the future I will probably look into using more modern easily available chips but it's very much a case of just getting the job done with the parts and skills available.
I actually doubt this will be the final thing I make regarding the C128 VDC output but until I learn to program an FPGA this is the best I could do at the time.