The sentence that tells us something that the authors do not agree on is: "At some point, approximately 7,000 people inhabited Easter Island."
In Passage #1, it states that Rapa Nui once was home to around 7,000 people, while in Passage #2, it suggests that when the first Europeans arrived in the 18th century, the population was only around 3,000, indicating a potential difference in their views on the population over time.