It is always interesting when people try and reduce dickgirls to androphilia vs gynephilia. This presupposes that the feminine body is a symbolism of gynephilia and the dick is a symbol of androphilia. But actually it is likely the case that dickgirls may be enjoyed in ways that are independent of androphilic/gynephilic symbolism, more in terms of abstract fetishism. A typical example may be of simple taboo. Another example crosses over with my own fetish (masochistic emasculation fetishism), which has an absolutely huge presence on the internet.
Going even further, it is possible that "cock" can be freed from masculine/androphilic association, perhaps even become an association of femaleness/gynephilia. Even the whole thing, may be freed from both masculinity/femininity androphilia/gynephilia.