text: "it is an "urban green space open to public recreation" 
  
  Where is it open to the public if the only place to access it is fenced off and says private property? The place you say there is access on the north west of Capitola Road is a wall of trees and fences for the houses according to the Street View images. There's a tiny path between them, but that's par for the course of any residential area bordered by a wood. It doesn't make them all a park. This is also a gulch. As evidence by creek name. So I doubt there's much room between the residential area and gulch for anything recreational. At least at this point, considering how dense everything is. 
  
  "This IS a "protected area" according to CPAD 2018a data (greeninfo.org), SCCGIS v5" 
  
  Seems like to your own accord that it should be tagged as a protected area then. Especially since the amenities that would make it a park haven't been built yet and like I say most of it's currently fenced off to the public. Then later on when the city actually builds the park there, if they ever do, it can be mapped as one. In the meantime, we can leave a note saying a park will built be there that can be mapped when it's eventually done. Remember, we map things based on what's actually there at the time, not in anticipation of something maybe or maybe not being built there eventually and it's clearly not a park in it's current form. By OSM's definition of one or even your own. 
  
  