The term in fantasy applies to any Human, because notice how she uses it regardless of the player's actual skin colour (Highlander, Mountainman, Elfblood or Orcblood). I think the more accurate claim would be her content, made particular by how losing your virginity to an Orc has a unique loss message highlighting the fact IIRC, is more raceplay coded than simply just 'BBC' coded. Literally, given she's a different humanoid species, but she also alludes to this IIRC during one of the Drunk Battle outcomes too. Selkie has a fair amount of mocking the player's willingness to enjoy pint-sized gobbodick too, with her non-date ending having people boo and yell at you both as she fucks you in public.
I remember reading that a lot of Majalis's pre-ToA works had raceplay themes, can't recall with what works specifically, but it's noticeable that ToA itself has no interhuman raceplay at all. Even dark-skinned characters have rarely any direct mentions of their skin tone, I think the only time that it has been applicable is with Story Mode (due to the default character being Lowlander White in contrast).
Orc Futa/Intersex in general does have a lot of Raceplay coding in a sizeable amount of the media it's in, same applies to Orc Male stuff too. But you've got characters like Alara that play in HEAVILY to Raceplay, which Elf Ladies do typically have in media also. Urka's content is flavoured very much by it being interspecies, hence why it's appreciated that she got more fleshing out with the Urka x Alma stuff focusing on her physical characteristics over her being an orc.
TBH, this is why I hope a quest for Urka is sort of like Kylira & Trudy's, but her wanting us to find foes or people for her to fuck. Then again, Trudy's quest requires us having sex with him and you can't even recruit Urka without having sex with her. I feel like they'll just make her quest like Alma's, rather than expanding specifically upon Urka's interactions with others. Alma such an indoor introvert, you gotta bring her people to have her widen her sex/social circle
TL;DR
Yes, but BBC is just a part of the umbrella of Raceplay fetishes. Urka is more about Interspecies, but isn't in-fact a stereotypical Orc due to her fleshing out & character writing developments.