You cannot defend your land property from even a marginally better equipped aggressor who seeks to take it from you. You need a court system, or for a larger aggressor, an army, to do it for you. This means that de facto, the state with the armed men owns the land. Land tax is tantamount to a fee you pay to lease it. Also it can be framed as just payment for a service rendered, that is, the service of defending your property for you. Furthermore, any entity that "owns" land property and gets protection of his claim by a court or army that does not pay a land tax is free riding.
Income taxes are unjust. By the logic of the premise, land tax that pays for anything but defense of claim to the land is unjust. Wealth taxes are unjust, as are capital gains. Tarrifs that fund a navy to protect shipments on the high seas would be just, as would registration fees to bay for highway infrastructure. The core rules are, the state must only solve a tragedy of the commons, the tax that funds such an endeavor must derive directly from benefitting from that endeavor and it must only ever be used for that endeavor. With these axioms it is easy to deduce which taxes are just and which are not, they're all payment for services rendered for a service for which a state is the optimal organization to provide.
https://falkvinge.net/2017/03/01/a-simplified-taxless-state-...