That's because you're lifting it out of the relevant context. He has already messed things up for them by previously claiming to be an engineer to government agencies and local and national media.

He can't unring that bell because he already accepted a warning (absent any fine or penalty) and agreed to abide by the Code on not calling himself an engineer and then repeatedly broke that agreement, so he doesn't get to keep selling his proposed traffic solution because of his demonstrated bad faith.

It's like someone who called themselves a doctor and turned out to have no medical qualifications being enjoined from wearing a white coat and a stethoscope and hanging around hospitals offering unsolicited medical advice.