No, indeed, they are directly linked. The box you referred to is a box that discusses some of the implications for the trend growth of the economy, the potential growth for the economy, as a result of some of the structural changes that are taking place.
The capacity issue you raised links that level of potential relative to the actual level of demand in the economy. So if the level of demand is below what the economy could produce on a sustained basis, that would lead to disinflationary forces. On the other hand, if the level of demand were to go through that level of potential and sustain above that potential, that would lead to inflationary pressure. So you have made the correct link.