Yes it does. Once again, exactly what is so confusing to you about the phrase "All legislative Powers herein granted shall be vested in a Congress of the United States"? Do you not understand the meaning of words like "herein" and "granted"? Do you not desire to understand their meaning or understand its application for political reasons? Or are you just plain dumb? I ask because I cannot reasonably see what you do not comprehend.
No it does not. The clause reads in its entirity, "The Privilege of the Writ of Habeas Corpus shall not be suspended, unless when in Cases of Rebellion or Invasion the public Safety may require it." Where does it explicitly say that it may be suspended only through legislation? Where does it explicitly say that only Congress can suspend it?