How would you define "Street Photography?" One photographer may have a different definition than you. I may have a different definition than that photographer. My thought... It freezes a microsecond of a human life. It is time frozen in that instant.
If you look for a definition on Wikipedia, you will find this: "Street photography is photography that features the human condition within public places. Street photography does not necessitate the presence of a street or even the urban environment."
“There are no rules for good photographs, there are only good photographs.” ― Ansel Adams