To the untrained eye I can see why there may be some confusion but let me reassure you this is a well done professional installation one that I would not hesitate to use.
It starts with galvanized Unistrut cemented into the ground. Then they mounted a thick sheet of diamond plate sheet of metal to the strut to mount the Bell boxes to. All are GFCI protected with metal inuse weatherproof covers in weatherproof Bell boxes. It does look like the top right receptacle outlet was an afterthought or added later since the EMT compression connector looks different than the others.
And finally large the gray box showing on the left is a single phase 120/240 volt NEMA 3 main breaker load center. The entire install could benefit from some RMR 86 mold and mildew cleaning or mild bleach water.
There isn’t any data communication connection in this setup, not 100% sure but likely you’re seeing someone’s string or rope they might use to tie up their cordage. There are 8 power cables running to the stands that need more power than a Jackery can provide. All but one cord appears to be a heavy gauge extension cable. That red one from the lower right can’t be more than 18 gauge.
The more I look at this, the less I understand. A couple of wires look like they carry power. A couple of the small ones look like they are low voltage and carry info.
Then, the whole "box" is disturbing. Open power connectors to the weather elements? Seems like an opportunity for problems. No numbers on any of them - first come first serve?
No locks visible.
I see one line on the backside. Doesn't look big enough to be the main input.
Weird !!
The most concerning issue is not fully unwinding the cord from the storage reel. That can induce additional heat and it creates a choke coil which can restrict current flow (more heat yet) if there are enough wraps still on the coil under high loading. The number 1 cause of insulation breakdown is heat. Paul