I think those cars are only incidentally parked there. Otherwise, I did not see any other indication that this area was to be used for parking, such as a sign directing drivers into this area for parking.

Secondly, I think that this area can only be used by parking by a small handful of individuals, e.g. managers or other higher-ranking officers of the organization managing this apparent construction zone.

I will take a closer look at this area when I have the opportunity to get a better idea what this place is used for. I will check for any posted signs that state whether this area can be used as parking by a wider group of people or not.