Based on your link, I didn't find any rule about the "3 fold rep" rule during Blitz.
I had the same question a few weeks ago, when I played black during this blitz game.
[Event "Live Chess"]
[Site "??"]
[Date "2011.03.27"]
[White "nathanp2112"]
[Black "pureredwhiteblu"]
[Result "1-0"]
[WhiteElo "1472"]
[BlackElo "1308"]
[TimeControl "4|0"]
[Termination "nathanp2112 won on time"]
1.e4 e5 2.Bc4 Nh6 3.d3 d5 4.Bxh6 dxc4 5.Be3 Nc6 6.Nd2 cxd3 7.c3 Bd7 8.Ngf3 Be7 9.O-O O-O 10.h3 f5
11.exf5 Bxf5 12.b4 e4 13.Ne1 Bg5 14.g4 Be6 15.Bxg5 Qxg5 16.Nxe4 Qb5 17.Qxd3 Qxd3 18.Nxd3 Bc4 19.Rad1 Ne5 20.Nxe5 Bxf1
21.Kxf1 Rf4 22.f3 Raf8 23.Rd3 Rxe4 24.Kg2 Rxe5 25.a4 Rfe8 26.Rd7 Re2+ 27.Kg3 b6 28.Rxc7 Rc2 29.a5 bxa5 30.bxa5 Rc1
31.c4 Rg1+ 32.Kf4 h6 33.c5 Rf8+ 34.Ke3 Re1+ 35.Kf2 Ree8 36.c6 Rc8 37.Rxa7 Rxc6 38.Rb7 Rcc8 39.a6 Ra8 40.a7 Rxa7
41.Rxa7 Rb8 42.h4 Rb2+ 43.Kg3 Kh7 44.h5 Rb6 45.Rf7 Kg8 46.Rf5 Rf6 47.Rxf6 gxf6 48.Kf4 Kf7 49.Kf5 Kg7 50.f4 Kf7
51.g5 hxg5 52.fxg5 fxg5 53.Kxg5 Kg7 54.h6+ Kh7 55.Kh5 Kg8 56.Kg6 Kh8 57.Kh5 Kh7 58.Kg5 Kg8 59.Kg6 Kh8 60.Kh5 Kh7
61.Kg5 Kg8 62.Kg6 Kh8 63.Kh5 Kh7 64.Kg5 1-0
With this definition of a 3 Fold Rep,
"In chess and some other abstract strategy games, the threefold repetition rule (also known as repetition of position) states that a player can claim a draw if the same position occurs three times, or will occur after their next move, with the same player to move. The repeated positions need not occur in succession. The idea behind the rule is that if the position is repeated three times, no progress is being made."
I asked a personal friend, fellow RHP player, and Tournament Director about this. He said that it's a draw, but he said that a completed score sheet must be present to claim the draw.
So, I believe it's a draw, but blitz websites aren't detailed enough to catch it....