I'm fine with them airing Lupin. They knew it wasn't going to bring in ratings, that's why they gave it a terrible timeslot right off the bat. It benefits from the exposure and they probably got it for almost nothing.
Making Super their flagship though, huge mistake. A mistake that will probably prevent them from even being able to consider getting Mob Psycho, MHA, Konosuba, Re Zero, Kabaneri, Tanya, Overlord, Gate, and every other recent anime that could actually do well on Toonami.