That works for property tax, but it doesn't work for land value tax, because the key difference between LVT and property tax is the former is based on the unimproved value of the property, while the latter is based on the value of the property as it is, with all improvements.

A self-declared value that is legally tied to an offer to sell at a fixed premium is clearly a self-assessment of the improved value of the property, not the unimproved value that LVT is supposed to be based on.