There's a big difference about making bold, broad claims about disrupting an industry, and lying about having developed a specific technology that is in actuality a complete fabrication. Even the most rampant bullshitters like Adam Neumann typically restrict their claims to mesmerizing future possibilities, rather than more specific claims about nonexistent sci-fi technology.

One interesting commonality they share is the willingness of established and powerful generals, bankers, and investors to champion their cause. It seems like the purest bullshitters have more backing from 'conventional' high status individuals than those with more weight to their claims.