Yes, it has. However, those 13 people do not feel you'll be able to go everywhere in that image, for one reason or another.
Actualy, if you look closely at the wording of the poll it says: "Will some of what's in the picture
not be accessible?" Hence a 'No' response in the poll actualy means that you
will be able to go everywhere, while a 'Yes' response means: 'Yes, some areas will be unaccessable'
I'm assuming that some people didn't read properly and thus the polls results are not valid.
About the picture, I belive 'composite' refers to the fact it is several screen shots linked together to get a view you wouldn't be able to see otherwise. Other than that it probably is not edited any further, it's just because the individual screenshots are so small compared to the whole, (as they are combined to make one picture) it appears to have a level of detail we find unbeliveable.