All property rights are created by law
All legal property rights are created by law, this is entirely true if tautologous.
But there are also so called natural rights. And it’s entirely possible for legal rights to violate such natural rights.
For example, I think we all agree that it is a natural right that a man owns himself. Yet there have most certainly been laws that allow slavery: the legal rights to property being in violation of the natural rights to such.
At which point Ritchie’s argument that property rights are conditional upon having paid any level of tax demanded falls apart. For those legal rights to the taxation could indeed be in conflict with the natural rights of those being taxed.