Everyone is exposed to an extremely powerful nuclear fusion IR flood illuminator every day, it's called the Sun. I doubt the tiny IR LED in your iPhone would cause any issues.
When you are in a dark room, they can be up to 8-9mm. This means 15x more light allowed in.
I am not saying that the LED in the video will destroy your eyes, but I do wonder if the eye-pain induced by the iPhone X that I had the past year is because of that.