You are correct, but I would like to share some additional information.
From the perspective of auditors it would be important to look for data in public sources of aerial/satellite images. Google Earth as you indicated it has historical photographs than can be checked to help identify possible land clearance. If the investigation on possible land clearance could be checked before going on site, the auditor would have information that would help him/her make the “right questions” to the auditee in relation to this topic and solve any misunderstanding during the audit itself.
With respect to sources of potential information in relation to HCV, we suggest that the auditor searches on available websites to gather information about protected areas and threatened species, such as http://www.ramsar.org , http://www.iucnredlist.org, http://www.birdlife.org and Integrated Biodiversity Assessment Tool (IBAT) for Business form IUCN, UNESCO World Heritage Site.
Many elements are necessary to understand possibilities of land use change, including local regulations.
In relation to the image, many elements are necessary to understand possibilities of land use change, including the presence of areas with cultural values, archaeological or historical significance, and/or of critical cultural or religious/sacred importance for the traditional cultures of local communities or indigenous peoples (these are also HCVs!). But in having said so, please look at the image proposed in the exercise and, from the perspective of presence of vegetation exclusively, the far right would the area to consider (but having the need to confirm that other aspects considered under HCV are duly met).