That's a blackra1n tethered jailbreak...
Have you looked into
redsn0w?
Thats false.
Redsnow would do the same thing with a tethered JB newer bootloader 3GS.
Please dont post false information if you dont know.
From the link you provided:
What if I have a late-model device?
If you have a late-model iPhone 3GS, or if you have an iPod touch 2G whose serial number begins with “MC”, or any iPod touch 3G, you can use redsn0w to jailbreak but you are currently restricted to “tethered” rebooting. That means you need to connect your device to a computer to complete the boot after a reset. Also, these devices cannot have custom logos.
To do a tethered boot after your late-model device resets for some reason, either run redsn0w again and select “Just boot tethered right now”, or run blackra1n.