I have no idea how you justify or even begin to consider assigning a 12th of all births as having some inherent necrophiliac tendency?

Probably with similar reasoning used to justify that the position of planets and stars relative to the earth can have any effect on a person's personality or daily life.

I'd have to look at the book and see more to say more, but actual astrology thinks of a sun sign as a single piece of a bigger interlocking system. If it's genuinely for astrologers, it's going to be a systematic breakdown and be much more involved than what that backside is saying, which imo is to get people to buy the book who understand astrology from sun sign columns going "yeah what kind of a kinky weirdo am I, as a cancer...? oh..." and maybe buying it, but the actual audience would be someone very different from that i guess idk esotericism is weird because with things like astrology, the marketing is at odds with the actual content you know?

have you considered that belief in astrology itself is just like that