Those honeypot phones clearly use marketing aimed at criminals and make all sort of false promises and clearly aren't technical and transparent projects like GrapheneOS. GrapheneOS community doesn't tolerate discussion of crime or implying you are a criminal on their official community chat rooms and forum. Doesn't make sense for it to be a project aimed at luring in criminals.
Anyway, GrapheneOS ships security patches very quickly, often bumps kernel versions quicker than the stock OS etc. Security isnt only reactive, also proactive. Some features like MTE even outrule entire classes of vulnerabilities.
The biggest difference is that the honeypot phones come with their own custom apps all claiming to have completely secure communications. That's their selling point, the set of apps, or even a single one, which they claim is unbreakable. The criminals buying these phones aren't interested in just GrapheneOS on its own. Clearly they don't consider something like Signal secure enough, even if run on GrapheneOS.
Well, if you're implying someone is a criminal because they don't want their phone come with the google buttplug and spyware installed....... I think you have a problem :D