Technically true, but here's how it is quite possible in a practical sense:
-There is a HUGE lawsuit against the city, mayor, DA, etc. for taking this woman's perjured statements and using it as a basis for criminal charges.
-The discovery shows the woman falsified her claim yet the DA and city went forward. That right there screams "Guilty" for the DA, mayor, etc.
-The city's share of the $220 mil. damages is one heck of a motivator for filing criminal charges against the woman to 'set the law right' and thereby hopefully convince the courts (juries) that justice was made.
-The city (and other defendants) may very well turn on the woman to save themselves.
Their grand criminal case was based upon known perjury and fabrications but was nonetheless pursued. When those kind of cases come down they can carry a lot of inertia with them.