Do we know when that video was taken?
It does not look like they are in production at that point in time and that does not fit to Elons massage from last night too.
If I look how long the structure is I have to say it is way shorter than the pictures I have seen from above likely from satellite. That would be proof that the video has been taken a while ago.
If its taken a week ago and just now posted the shorts would create a wrong impression where they are today.
To add to this there is a full load of new videos emerging as we speak. They all look like they have been taken at different stages of building that new structure.
https://twitter.com/IspyTsla/with_replies