Wiping iPhone using iTunes and signed ipsw file

hello,

I recently wiped my iPhone 11 using ios14.2 and started fresh by wiping and reinstalling the firmware using iTunes on a windows 10 pro PC.

when setting up the phone from scratch with a new iCloud account - something jolted me - the personal hotspot details - phone name and password survived this process. Does this mean the wipe was unsuccessful? Nothing of this phone should have survived (as far as I am aware) the process of entering download mode and utilizing iTunes to reinstall the firmware. How could these network details survive - is this normal? I reset network, privacy, all settings and then factory reset within the device before the firmware update so I’m a little shocked by this detail coming across!