To clear a table is to leave nothing on it. That is the sense the word carries over, and it is why the word was chosen.
Detroit did not vote to destroy Black Bottom. It voted for clearance, and clearance sounds like housekeeping. Hastings Street was the commercial spine of Black Detroit, and the city ran a freeway down the length of it, and the file calls that an improvement because the file was written by the people doing the improving.
Watch what the word does to the sentence. It takes an act with a hand behind it and turns it into a condition of the ground. Nobody clears. The land simply becomes clear.