[HHad3]

SysCfg with serial number etc has been on a separate NOR chip for quite some time [1]. I wouldn't be surprised if Apple allowed DFU restore to initialize a blank flash as mere optimization in the production process.

[1] https://www.theiphonewiki.com/wiki/NOR

[kalleboo]

Your link only lists NOR sizes for the original iPhone and the iPhone 3G and then goes on to say "iPod touch (3rd generation) and beyond -- The NOR is replaced with a dedicated partition of NAND"