Have a MBP Pro 16
Followed the instructions. The extension was gone.
Rebooted but the panic error re-occurred.
Rebooted to safe mode.
Ran Cleanmymac to remove system junk then trash bins.
Rebooted and now it works flawlessly.
Did have to run the utility to delete Norton files again - some stragglers were not deleted the first time but this had no effect on the machine working.
Hope this helps others.
readim
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