The "objective" of this economic activity is not to produce anything useful, but rather to keep people employed.

One Georgist author has noted that there are a lot of things which need doing, and according to him, the reason why we have unemployment is because land is too expensive, and the array of taxes which exist act to reduce employment. Further, the wealth accrued by LVT would allow the employment of people in useful tasks as a separate measure.

The Geonomist approach is : lubricate the economy better by introducing LVT, and it will run better and employ more people. Taxing land rather than production would change the supply and demand curves so the equilibrium level of employment would be higher. That's a positive effect, but its not clear that it would be so much higher that it would completely eliminate unemployment, and you are assuming the operation of supply and demand curves with no other compensating effects.

But, from a Galbraithian perspective, the issue is not the efficiency of the economy as such, because in terms of its objectives, it will forever be out of balance. The economy must generate more and more useless goods, and spend more and more time selling those useless goods to people who do not really want them. Making the economy more efficient will not help this problem.

Its an intriguing explanation, but there is limited evidence for it. But : how much evidence there is for the Geonomic position ? Probably no more. To the extent the conclusion is a natural consequence of the assumptions without reference to external proof, the Galbraithian explanation is every bit as good as that Geonomic one.