It would be really weird if somebody found out their female elf wasn’t named what they entered in the character creation screen, but was actually Gustav.
Indeed ... but it was codename for game, not character.
Maybe thats the way the name was created ... they wanted some gender-neutral version of their game codename.
To be honest I never seen much reason behind this code names ... I mean if you are afraid that someone will leak that they are working on Baltimore's Gate 3 ... how is calling it project Gustav helping?
Same person can leak that they are working on game that is set in Faerun, with such Races and Classes ... so there is no doubt it's based on DnD.
Of course I know there's several branches this description would fit ... but still.

Ah ... dunno ... the best explanation seems to be that game developers are superstitious and don't want to celebrate too early.
