It seems like you're talking about one specific supercharger? Maybe even this one? I'm talking about quite a few others.
An example of one of the ones I'm talking about (a supercharger on Tesla's map that says "Target opening in 2019" but has not broken ground is Woodland, CA. It's been on the map for two years (at least), and Tesla only recently applied for the permit. No ground has been broken yet.
Until recently Kirkwood was also on the map with "Target opening in 2019". It's off the map now, no permit ever found, no evidence of any construction. I can give you more examples, but you get the idea. There's lots of evidence that Tesla's "target opening" map is purely aspirational. That doesn't mean that none of the ones on the map have broken ground, just that you can't go by their map.