[ShakeZula06]

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Why isn't our current system considered AC?

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Enforced territorial monopolies who hold legitmate right to squelch competition in it's "services" and holds a monopoly on legimate theft. It's going to be tough to find a business that acts in that manner.
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Consider the following: ACland opens for business. People acquire their initial properties from homesteading.

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Property is already aquired now. What property is left for homesteading?
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Soon people find that they want to maintain some semblance of order amongst their neighbors, so they create what are essentially homeowners associations.

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HOAs, while they would likely exist, would not likely be very highly used as it's not to effecient in all matters. First and foremost in retaining order would be private property, followed by contracts and arbitration, all of which not only can be supplied without HOAs, but would be provided better without use of a HOA.
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Once a member of the HOA, your property is encumbered by the rules (i.e. all HOA rules run with the land.)

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This seems incredibly unlikely in an individualistic society, especially one that preferred the fruits of the free market. If people came into an AC society, it's unlikely they're going to care for rules, especially ones they can't back out of unless they move outside the HOA.
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HOAs might soon band together and create towns (to minimize costs of, for example, police, fire protection, schools.)

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There would be towns without HOAs in AC. Minimizing costs for services by monopolizing them doesn't make sense. If society were to become AC it would because people recognized such services were better provided by a free market.
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If all available real estate were eventually a part of an HOA (or a larger town, county, state, country) has AC evolved to statehood?

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It would depend on the nature of the HOA's rules. Either way, this is a very unlikely senario for the reasons I gave earlier.
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Would that state be considered AC even if in 5 generations none of the existing property owners actively consented to the original creation of the HOA?

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Possibly, it's definitely coercize and against the meaning of anarchocapitalism.