I don't think I could get that by my DM, because the text in Singer does seem to override that, yes *I* know it's flavor text, and *I* know the sidebar on page 4 is badly worded, but in Singer's entry itself, it says how True Dragons can enter it, "True dragons with the ability to cast divine spells as arcane spells could enter the class, but not many do." Not to mention how the class itself seems to think you will have a good number of cleric features...
I *would* however, say that perhaps someone in her backstory has it...