Max's search of the minds of the Greater Energy beings linked him into the mental equivalent of a large group chat, much like what the Illithid had among their own species. They had to know that he was listening in, but their thoughts said that it didn't matter and that they would be able to crush him soon enough, and then there wasn't a force left in the Galaxy that could counter them.
The Humans' home galaxy was fated to fall first, and then their subspecies and outlying Galaxies would fall later, until everything in this region was destroyed, and then they would retreat before they had been siphoned of so much energy that the dead Gods buried here could revive.