I'm 100% sure its a photo op. Think about the logistics of the trucks taking spoil away. How can there be one arriving and one leaving at each location at this time: the diggers near instantly fill their entire capacity?

And the narrow access road is way too congested for all those to actually leave or arrive at that rate. Moments after the shot, the trucks will clearly all have to stop and wait.

This being said, there is power in that many machines in the same place at one time. They would cetainly be able to get work done quickly. Just not quite as quickly as it appears in that shot. Waiting is part of the process, you cant have a system where every component works at 100% capacity

A truck like this represents a substantial amount of investment that costs almost the same if its sitting there as it does doing actual work.

Not to mention the opportunity cost of having other similarly well equipped crews having to wait on you finishing the job.

Why would you be surprised that no time and effort is spared in coordinating the work of these machines? Its like being surprised that items are constantly rolling off the factory production line, and its not just the occasional item showing up at irregular intervals.