Of course it doesn't, if you don't bother to read it.
Guess they missed the part where it says “Congress shall make no law....”
The Constitution doesn't start with the premise that the federal government starts with no limits, then has explicit limits imposed.
The Constitution starts with the premise that the federal government has no powers, then has explicit powers granted - and the entire list fits on one piece of paper; if that's not a limit, there is no such thing.