The title says it all. He somehow has a nick called "Swizkii" or is just playing without having registered connectivity. You can't report him, saying he is not online. He is fly hacking and everybody knows it. We all told him to stop and ignores knowing we can't stop him
I'm not sure if I can record this, but you can try it yourself. Go to fastbridger and then place a block. Keep right clicking on it and your block counter goes up without you actually placing a block.
On fastbridger, the thing in the scoreboard that says your blocks actually doesn't count how many blocks you placed. It counts how many times you right-clicked on a block you placed.