They're not celebrating “whatever”, they're celebrating modding.
Stapling unnaturally large breasts on characters where they don't belong is stereotypically one of the first things modders do to games, so making fun of that seems like a perfect way to celebrate modding (as long as you've got any sense of humour, which Larian most definitely do).
I don't usually kink shame, but if you consider boobs on a male corpse presenting presumed avatar of a Forgotten Realms (ex-?)god of death “fan service” you've got some seriously weird kinks, dude.