Revenue effect unclear
The point made in the parent node to this refutes the employment gains plan claimed by Diamond on the ground that the labor supply response could be extensive (more workers) or intensive (more hours). However this may not change the added revenue arising - and hence the affordability of the plan.
This point underscores the importance of being clear on what we are arguing about. Romney has claimed, based on the Diamond study, that his tax reform plan will add 6.8 million workers. However this is separate from the argument about whether the added revenue from growth claimed for his plan will be sufficient to fund all its objectives.