So before they redid the metars in 2004 the code would have been W007. That a W, not two V’s. That was decoded as indefinite. After 2004, they changed it to VV, or vertical visibility which means roughly the same thing; hard to tell, but this is what I think the ceiling is. I wonder if the code to English decoder in use in your example is combining the two or was in use prior to 2004 and was updated.