sure!
for one thing, Aranea's statement that
for humans reproductive relationships are exclusively heterosexual essentially ignores the fact that there are transgender women who can have children with other women, transgender men who can have children with men, etc., etc. she conflates sex with gender, indicating that she's not familiar with the difference between biological sex and gender identity that is commonplace these days.
it COULD easily be argued that Aranea is referring to 'biologically' heterosexual reproduction here, i.e. the combination of female sex cells and male sex cells to create an embryo. and that makes sense! but what she says next makes that seem kind of absurd in context:
for trolls they are 8isexual, for leprechauns they-
(though we never actually hear what she intends to say next, the common assumption is that she's going to say they're homosexual, based on context and the fact that caliborn and andrew later discuss the leprechauns apparently all being the same sex.)
this makes no sense if she's talking about 'biological' heterosexuality, because 'biological' bisexuality doesn't make a lick of sense. to put things as simply as possible, bisexuality requires two sexes or genders to be attracted to. but if both of these "sexes" are capable of forming reproductive pairs with either other "sex", how could they possibly be different "sexes"? that would make them all serve the same reproductive purpose. that's not bisexuality, that's hermaphroditism.
biological homosexuality would make even less sense. homosexuality - "same" sexuality - is, obviously, an attraction to the "same" sex. there can be no "same" sex if there is only one sex! again - that would be hermaphroditism. if we are to assume there are also "female" leprechauns - worth noting that the members of the felt are only called "males" because
BECAUSE [CALIBORN] SAYS THEY ARE - who are ALSO homosexual, then the males and the females would not be reproducing with each other. and in that case, what even makes them the same species?
though we have no reason to believe Aranea is flat out "WRONG" about the things the says, per se, she uses all sorts of nonsensical terminology that would imply she doesn't have the right cultural context to properly be able to identify and talk about the workings of the biology and identity of alien species. being from a race that traditionally organises itself into binary genders, it would make sense for her to see that cherubs have two distinct sexual morphs and think "hey, that's just like the 2 genders on my planet!"
for what it's worth, shelby cragg, the artist who did calliope's drawings and worked closely with andrew for a lot of the cherub parts of the comic, also thought that aranea's gender assumptions about the cherubs were sort of off base, but you'd have to take my word for it bc the blog they used at the time is long gone.