I think the examiner is being pedantic but it depends a bit on the context. The essential question really is are you happy you can navigate visually to the airfield. So in certain conditions if it's gin clear and you are familiar with the environment then I see no problem with anticipating the field in sight call. On the other hand in marginal conditions and/or lack of local knowledge I might actually delay the call since I might need some radar back up to be absolutely sure!
In summary, it all depends.