[stickfigure]

38% for $1,000/mo vs 31% in the control group seems like a pretty disappointing result to me. Maybe not insignificant, but more lose than win.

[vannevar]

Maybe 38% vs 31% saved the city a large amount of money. The question wasn't whether the results disappointed any particular individual. The author's claim is that Denver overstated their results and that turns out not to be true.