I'll repeat myself again, but Bubbuka is a retard. He can try and draw any type of real life kid and you wouldn't even know because his art style isn't realistic enough for that. The only reason I knew that LauraB was a thing in his art myself is because I've been on 4chan.
What you should consider is your own safety, since the law does not differentiate. If they drew it off child pornography, it should fit the "digitalized child pornography" category and you then, as per the law, possess child pornography.
I'm happy with avoiding Bubbuka because I don't like his art anyway, I find it pretty meh.