As far as I know, that's not true, as Jenkins exited well before the film entered pre-production.
Well, that's a good point I hadn't considered either lol.
That said, I'm fully expecting a delay. It doesn't seem like Ant-Man really will be all that important with the material that's there. It's not like Wright necessarily cost Marvel a budget worth a truckload the last 8 years since most of it was script occupation in between working on Scott Pilgrim and The World's End.