You seem to think Bluefall is arguing that Lois couldn't have done what she did here. Bluefall is saying that she wouldn't, because she could have known more going into the dinner and on the basis of that extra knowledge would have taken a friendly approach from the start.
She's not saying that, absent the Superman connection, she would have been stymied for lack of resource. The argument is as follows: A. "Just ask Superman" is an easy and obvious step that could tell Lois that Oracle exists, is a valuable member of the JLA, and is specifically connected to the Batman and B. Lois Lane is not Rube Goldberg. So she asks Superman and goes into the dinner with a preexisting confidence in Barbara's upright moral character (Could Lois have possibly failed to connect Barbara and Comissioner Gordon? Could she be ignorant of the fact that Gordon is the GCPD's strongest link to Batman?) which isn't evident in the scene.
Telling us that the one who's saying, "Lois shoulda known a bunch of stuff she would easily have known but apparently didn't know" is the one who's selling Lois short is a hard sell, Gail.