I'm the dude who made that post.
What info would you like about the brickage?
I used RSDlite 4.7. the flash get to the reboot point and then got a bootloader error that said "bootloader err:A5,70,70,00,1f". I found this was the same error that DroidX users who OTA'd to their 2.2 update and then tried to SBF back to 2.1.
I'll keep the details of the conversation on the other thread to keep things simple...
But the additional info you posted does link this to the same error code on the DX, so looks like R2D2 owners w/what is probably updated bootloader code are going to need to stay away from the D2 2.2.20 SBF until we have more info.