In the window film industry, what we call blackout film would allow no light to pass through and I don't know of any static cling blackout film. You could leave the adhesive protecting clear cover sheet on the standard blackout film and use it in a static cling type installation. However, on sun exposed, dual pane windows, a blackout film can absorb more heat than the window unit can handle and you could experience seal failure or glass breakage. We do have films that allow no light transmission, a silver reflective opaque film for example, that would generally be a safe installation on dual pane glass. Also, window film that is not static cling can still be removed from the glass if desired.
By the way, that gila film is dark tinted, not opaque.