The full analysis linked from the article does look at car travel times. The TL;DR of it is: Compared to a control street they increased immediately after installation, but have since stabilized and show little difference.

If you're concerned about showing a complete picture you'd have to look at more than just travel times. Add in account for for safety, noise, environmental impact, cost, air quality, etc. Buses will be a clear winner.

There are other costs than just time to transportation, ignoring the fact that their analysis showed little overall change to car traffic