Nope
You must be registered for see links
That scan literally shows that he did know and he believed it wouldn't matter Lee would still lose, not only did he know about them he underrated them as well.
I'll sum it up for you since you didn't seem to understand it, Neji said:
Lee, even at the end you didn't realize you can't win sacrificing your body.
Neji knew what the Gates did to the body and he knew Lee could and would use them, in Neji's opinion though this was a power not accepted by fate so he saw them as trivial at best.