Did your friend say 10,000 times faster or 10,000 times bandwidth? By using different color simultaneously , you can stuff more data but I can’t imagine it becoming faster than speed of light it already travels at.
While you're technically correct, isn't it pretty much an accepted fact that when people refer to the "speed" of internet, they are actually talking about bandwidth?
E.g. "how fast is your internet", etc.
It's of little value to the end user to know how fast a bit travels, all they care about is how fast they can download.
