gen has been unusually resistant against the dreamshape's infiltration, delaying it's hatching by a good decade.
This means that if there was a mass deployement, for the majority of people, the hatching occured years ago. And given that such a thing would have likely had major societal effects, some of the implants or thoughtforms should have had memory of it. So, either that too got filtered out, every staple has been doing the dream resistance thing, or the shape has filtered itself out of memory.