It most certainly has nobile in it. The size, the leaf shape, the flower color all have contributions from nobile. If it was a hybrid of those 2 dwarf species with yellow flowers, it would be a dwarf plant with yellow flowers, which it is not.That other parentage came from someone who hadn't seen the flower, and didn't think about size. The internet echo chamber strikes again.
A. lindleyi has those hairs. "Blunt leaf hairs which are somewhat sticky" says Schulz. I don't claim to know the story but I'm perfectly happy with lindleyi being the other parent (though it could be something else I suppose). This species is relatively common among succulent collectors because of its supposed healing properties with respect to Euphorbia juice.
