Because there is a big chance iOS 6 will be announced at WWDC 2012 in June. Therefore this French iPhone hacker thinks, why not saving energies and brains to welcome the upcoming iOS 6 and beat it, instead of diving deep into the iOS 5.1 to find vulnerable exploits to be delivered as untethered jailbreak?
So your vote is decisive to determine the outcome of Pod2G's decision. If the majority asking for iOS 5.1 untethered jailbreak, he will continue his existing work, or if the result is otherwise then you should stop wishing the release of 1.5 JB at least from this guy.
At the time I am writing this post, the poll has managed to collect 105656 votes. Users that asking for iOS 5.1 jb is majority compared iOS 6 Jb currently.
Interested to influence the hacker's decision? Why don't you participate and vote your voice! Visit the poll's site here.