Unless A&C are specifically stated in-show to be an ace couple (there is still hope), most viewers will assume they're homosexuals, not homoromantic asexuals = not ace representation. Same thing goes for B&G. Not explicitly ace, so reads as heterosexual = not ace representation.

Wait… sorry I’m just a little confused. Are you calling Beelzebub and Gabriel a heterosexual couple? Beelzebub is explicitly NB, stated in-show through use of they/them pronouns