It worked … sort of.
I took out the burner element and tried blowing through the supply tube. It was completely blocked. I blew as hard as I could and heard something blow out of the orifice that feeds the burner. Put it all back together. The water heater now heats water. However … the flame is uneven and slightly “noisy”. The burner itself showed a surface patina of rust. Some rust particles had accumulated on the top face of the burner. I’m shopping for a new supply tube and burner now.