"...buy a bond to pay for the property tax."

That is absolutely not allodial title. An allod has no higher authority to whom they owe allegiance. All Americans under the Constitution are regarded as absolute sovereigns, like the kings and queens that were then the rulers of the monarchies of the world, whom Americans had just successfully defeated in war and revolution.

This is what i have heard from people who have gotten allodial title.
That, basically, it cost them a bond, the amount of which is the same as pre-paying the property taxes for years.