Its not, 1.2 TB is the compressed version, the uncompressed set is 4.7 TB. As for the torrent, its now posted for 5 pieces, 1 click to add 5 piece tablebases to your favorite chess program. The tablebases make a dramatic improvement in game play in the end game where chess programs are notoriously weak.

Computer CHess has the torrent for 5 pieces along with info for the remainder of the parts, along with some general info on computer chess.

Why not make P2P do something legit for a change.