Can I use "it means" instead of "that means"? Are they have the same meaning?
Yes, correct. You can use "it" here instead of "that," and this would not change the meaning of the sentence. However, the speaker has used "that" to directly refer to the previous sentence. "This" can also be used to express a similar meaning. Ex: The teacher's here. This means class is about to start. = The teacher's here. That means class is about to start.
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