A new Rocket League "Cleaner" is released which essentially is removing PC bans at this point of time. It does not touch the kernel and is not spoofing hardware serials. It only deletes tracer files from the computer.
It's purpose it to allow you to play again without cheats and without receiving a ban on a "flagged computer". The product is beta and may include some bugs, please report back if anything is unclear or you experience problems.
Steps:
Run Cleaner
Uninstall Rocket League
Reinstall Epic Games Launcher
Register new free account
Install again Epic Games Launcher
Install Rocket League
Play without cheats for a few days and report back if you got unbanned.
You will be able to find the free cleaner in the GOS Loader. Here is a screenshot.