It is quite likely that these planets didn't form in their current positions. Although it looks likely that terrestrial planets can form after the migration of a gas giant, the situation may be different in the case of (super-)terrestrial planets which form later. But there's certainly room left for habitable planets. Unfortunately, detecting an Earth-sized planet in the star's habitable zone is very difficult.

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Science is a way of trying not to fool yourself. The first principle is that you must not fool yourself, and you are the easiest person to fool.
-- Richard Feynman