Ehh nope, He did it correctly. As the tags suggest, this is a Groupflght. And a Groupflight must depart within 3 hours of posting the main post on IFC. So he did all right.
Please check below, for how Groupflights works.
If you are referring to the time of the day being to late for you join then, maybe find a different groupflight or a event maybe to join that suits and meets your schedule perfectly.