Previous decisions considered that as yellow emojis are intended to be neutral or 'non-human', it wasn’t deliberately exclusionary having no black families. Because theoretically there weren't white families either. Only yellow.
But given studies show how white people use the yellow / default emojis at higher rates than those with darker skin, the family emoji situation was left favouring light-skinned families until now. From 2020: https://blog.emojipedia.org/on-families-and-equality/