You already know that at the moment there is no decoding solution for the iOS 5 basebands and the Dev Team seems a little bit out of step with the situation. Considering that no other credible team presents data about the development of a possible unlocking solution, various people appear on the Internet who try the "sea with salt". react0r is the latest attempt by a so-called hacker to prove that a decoding solution for iOS 5 exists, but I recommend you not to get your hopes up too much because this is not the first nor the last person who tries to deceive hundreds of thousands of users.
react0r is most likely nothing more than an attempt to attract the attention of users, but if it turns out to be a real decoding solution, I will let you know.
