I don't think it's very plausible. The subtext of the photo is "that looks comically unlike what you'd inspect from a sewer inspection van". Well, I can tell you pretty much for sure: thats' what the inside of a sewer inspection van from that company looks like.
It took just a couple minutes (less than 5) to go look this up and find the video, for what it's worth.
Maybe it's an NSA wet team! Wet, because they do sewer inspection work. :)
I think if they're buying a fake sewer inspection van they're probably smart enough to find one that doesn't look to people on the Internet like it's a prop out of the movie Enemy of the State.
I hope the owner of the company doesn't read this. They probably like their designs! :)
I just went to Google maps to the address written on the van's passenger door and lo and behold, Google did drive down the alley behind and while this is a larger vehicle and not just a van, that's their look (they also have black versions if you look around): https://www.google.com/maps/@33.7851188,-118.211276,3a,67.3y...
It took just a couple minutes (less than 5) to go look this up and find the video, for what it's worth.
Maybe it's an NSA wet team! Wet, because they do sewer inspection work. :)