I think I get it now, but it took some digging. “Rhythm and Flow” is/was a hip hop reality show with Cardi B and Chance the Rapper. Flo is the spokesperson for Progressive Insurance. So “Rhythm and Flo” is a play on words combining the show and commercial.
The bigger issue for me is that the water seems to be missing in the first panel.
I feel the mechanic is being a little too informal. He should call him “Mr. Dumpty” until they get to know each other.