MAGA used "Brandon" as an attack on Biden. Biden went with their paranoia and created "dark Brandon" MAGA assumed the Superbowl outcome was orchestrated by Biden (Dark Brandon) and when their paranoid assume was realized in the outcome, Biden trolled them with a Dark Brandon image and sentence.I have no idea what that means
Politically the more unhinged MAGA gets the more any sane people still around will tend to reject their paranoia.