The phrase "Let's go Brandon" is referring to a viral video of the NASCAR Racer.
In the video, the crowd behind him is chanting "f*** Joe Biden" however, the NBC reporter is claiming the chant is "let's go Brandon," which has since been referred to as a form of damage control.
https://www.the-sun.com/news/3849893/what-does-lets-go-brandon-meme-mean/
It has nothing to do with the racecar driver Brandon. He just got caught in a moment where the crowd in the background was chanting "FU Biden". The lying interviewer called it a chant for Brandon.
