Archer's memory is a bit better on this than mine - apparently - as I do not recall the discussion.
That said, I would play it as it is stated in the paragraph entitled: The Homebuilder Protectorate. They are more of a militia, not an army, and, as such, would not use mercenaries, advisers, other corporation's forces, etc. I would consider the mention of "Does not use Inheritor Tribes" to be a typo.