You can listen to their own description of their strategy and tactics. It was every different from the contemporary counterpoint. They reformed one system one subsystem at a time by working with the current owners and tech staff and teaching them their approach.
https://changelog.com/gotime/154
I knew contractors in their wake working at companies that grew out of their work in CMS, such as Ad Hoc (a name of the original team to not be called WHITE HOUSE HOT SHOTS or DOGE or something similarly jarring to thereby take agency away from the people who had to you know do the work once they knew they'd roll off) and Nava as they expanded beyond that one system 5 years later.
Let's see how the braggadocios we'll solve all the problems at once flavor of the moment goes, then judge the healthcare.gov teams.