Because it's 2021. In 1990 or even 2000 it would have also blocked lesbian.
I'm implying that Apple likely looked for that term specifically and unblocked it, while they didn't care to check for the term Asian. But I wonder why?
I implied the same, and also kind of gave away the reason: because it's trendy for companies to pretend to care for LGBTQ now, and censoring it in 2021 would be a faux pas (Yes, Cook is himself gay, but that's not it, because he never was one for causes. Despite being ultra-powerful and rich, he only "went for the cause" for himself and Apple after it became Disney-safe to do so and every company did it - unlike the gay pioneers of the 60s to 90s who did it under really hostile environments).