Ah. I see. The alerts were conveyed directly to phones via primary avenues: Wireless Emergency Alerts (WEA) and Emergency Alert System (EAS). Those alerts included a link to their Xhitter account.
Every Amber alert I've seen has included location, name of the adult, license plate, vehicle description, a description of the child, etc. Most include come kind of link (secondary avenue) that (in my experience) just shows the content from the alert, and doesn't actually provide any further detail.
Have we confirmed that this alert included only the link to Xhitter, without the other data? If that is actually the case, it's not just the CHP's failure, but also the managers of the WEA and EAS systems: They aren't supposed to activate those systems without the actual message.