The claim was that they put up speed bumps (and other measures) _with the intent of_ making driving worse to encourage public transit. That's obviously false. Speed bumps get put up to discourage unsafe driving.
If, when forced to drive safely, people would rather take public transit, that's kind of scary, but also a good thing I guess to get unsafe drivers off the road? However, that's not what the claim was (and in reality is unlikely to be true, though I have no data to back that up).