It is a little exaggerated but add in snap and other benefits and it’s not far off.
Once you start doing that, you need to calculate whatever benefits people could still get with their $30k salary.... and it never ends. I also think they may have added stimulus money to get to the $47k, but didn't calculate that someone making $30k got the stimulus, too. I don't believe it was meant to be super accurate; it was to make a point.