...yes? It's pretty clear from the video this was done as a "test."
The article mentions the drivers experience working on FSD and they have a YouTube page dedicated to stuff like this linked in the article.
So the test involved letting the car go at 30mph through a live intersection, not taking any emergency steps such as checks notes stepping on the brake when approaching the red light at 25mph, and then cursing about it afterwards and STILL not making any attempts to correct it?
Unfortunately, yeah, seems that way...just like you said "they chose to do nothing" and luckily no one was in/approaching the intersection.
Look I'm all for knowing this information, that something like this can happen. But to be clear, in no way do I condone how it was done. This seems reckless for the sake of clicks.