I did this the other day just to see, and my phone didn’t explode. It cleared 20GB of System Data.
Sadly, all of that & more is back on the phone lol
DO NOT EVER DO THIS on your iPhone.
That "Airplane Mode change date to 2027 wait 2 minutes" trick to free storage can seriously mess things up. Yes, it may delete caches/temp files, but it also wipes important local optimization data iOS uses for Screen Time, app tracking, battery efficiency, signal optimization, predictive usage, and Safari tabs.
Those cached files are not just "junk".. iPhone uses them intelligently to learn your usage patterns and optimize the device over time.
If you need storage, use Apple's official methods like Offload Apps instead.