Tideman's proposal is for the costs to the system to be absorbed by the current holders of property.

As a first approximation, people would continue to hold title to the land to which they now hold title, and would continue to owe whatever money they now owe. But compensation could be sought on a case-by-case basis, by individuals who stood to bear the costs of the moral accident disproportionately and did not have substantial assets. Any financial institutional whose continued existence was threatened by the transition would be bailed out in exchange for a significant fraction of its equity. The costs of the compensation would be paid by a capital levy.

I don't think this proposal is feasible. Many people owe more than their entire net worth on their primary residence. The plan is to tax land to the point that the value of land for that residence goes to zero leaving only the value of the structure on that land. The structure value is often a small fraction of the total current value of the home. This puts people sizeably underwater and would result in a fair number of people forcibly vacated from their homes as banks sold the structures to pay the mortgages.

The bailouts of various financial institutions would be expensive, as would the system shocks from the various losers on the mortgage debt. Lastly, many people in old age sell their homes to pay for living in a nursing home until they die. This option would become infeasible if we drastically reduce the value of their homes and given their old age they would have no viable alternative to generate alternate capital.

His proposed solution to this is a vague and nebulous "case-by-case" compensation for disproportionate costs without adequate assets. Depending on your definition of inadequate assets and disproportionate costs the total cost of this compensation can range from nearly $0 to the vast majority of all current property values. Keep in mind that a sizeable percentage of the population owns a single family residence that is a disproportionate portion of their net worth and generally factors into their retirement plans. I'd argue that every such individual is disproportionately impacted and does not have adequate assets.

Zillow estimates the total residential property market in the US at $33.6 trillion dollars. I can't find good statistics for single family owners vs landlords but it's easy to assume that close to 50% of the market will be situations I described. This makes it quite possible for the homeowner compensation to be in the area of $16.8 trillion dollars.

Similarly, mortgage debt is often held by pension funds that would struggle to pay their pensions out if that wealth suddenly evaporated or was vastly reduced due to people abandoning their homes. The current US residential mortgage market is $17.6 trillion dollars. Assuming half of this qualified for hardship we'd have $8.8 trillion dollars of subsidies.

There are other institutions and individuals adversely effected and a program to adequately compensate them all may well cost as much as the current US debt which is currently $30.5 trillion dollars.

I think Tideman vastly understates the problem. The introduction of LVT would arguably be the largest wealth transfer within a nation in human history and by his own admission mostly transfers wealth from the old to the young. It has sizeable risk of transferring wealth people can't spare, particularly transferring wealth away from those no longer work and cannot easily generate new wealth.