Agreed, and I'm pretty sure the only thing Gunn has said about her was "we've talked about maybe doing stuff and she's down." Just like he said they "talked about doing stuff" with Ben Affleck (only for Affleck to come out and say he wasn't involved).
And on Gal's side, we already the infamous Henry Cavill walk-back, plus we had The Rock insisting that he was gonna be part of the new DCU with his JSA (and his team even leaked stuff about a Hawkman spin-off to the trades). I'm not taking anything as gospel until Gunn confirms it, and I'm not sure how much he's even at liberty to say during the strikes. Never a dull day as a DC fan...
Grace Randolph is notoriously unreliable, but "they talked about possibly developing it and there's no deal signed" sounds like the farthest possible thing from confirmation. They probably talked about it as a gesture of good will after axing Patty Jenkins.