He might've been on G5, the time that panel speaks, and the prior one with the Gorosei, is about the incident that will happen, not that already happened.
The panel prior, had the Marines lined up with the quote below saying a war against the VP was imminent, to what followed Luffy's appearance being unexpected and something will shock the world a day after.
That scene is never portrayed about that incident happening already since it's a day prior.
