Exactly! If building a new lane doesn't immediately ease congestion then demand hasn't been "induced" it's just that the already existing demand has been demonstrated as being insufficiently addressed.

That's the case most of the time anyway. There are situations where making travel along a road better does improve the situation at first, but it leads to attracting the development of new destinations along that route which can increase the demand for travel on that same road.

For most places the amount of redesign required to fix our terrible traffic infrastructure is going to be a huge problem, but there's hope for new developments and growing cities to avoid these problems and provide amazing public transportation, bike lines, walkable spaces, and better zoning.