Maybe they just mean that the "optimal" SH path has you
end up with a blonde, sweet, good-aligned cleric?
But that is a fairly superficial similarity. I can see where they might think that, IF SH's writer played BG2 (if he did I can't tell), he saw the arguments between Aerie and Viconia and thought "Oh wow, Viconia is such a meanie, I bet she would enjoy literally torturing a sweet innocent girl." Which would be a conclusion that only takes one sliver of Viconia's character into account and doesn't understand her at all.

Also, IMO Aerie has a lot more reasons to "whine" than Gale. She tried to help a child (when she was probably little more than a child herself) and for that, had her freedom and wings painfully taken away from her. She can be moody and irrational, but I can see why. Meanwhile, Gale
was an archmage who wanted to one-up his goddess gf and made a stupid decision with full agency.
He got hit with a reversible curse; Aerie lost two of her body parts, forever.