Hard to say, some creators are wired different upstairs which can be both good and bad. Personally I don't think she really expected a real positive reception from everyone, maybe the NTR bros and her more loyal fanbase, and the only real mistake she made was doing her social media stunts which drew more outrage and attention.
I agree with you in that Airi definitely failed if she was trying to desensitize readers towards NTR because the execution near the end was still a little bit rushed even with a 20+ chapter setup, and it was still riddled with plot holes (like how does Shinobu not catch up to a Sakura running in a skirt...)