macos – How to remove all traces of a kext?

I am trying to completely remove a kernel extension that I have installed by mistake and I do not see how to remove it from the list of disabled software. It appears in System Information and in the System Preferences security pane.

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I've grepped / L / E and / S / L / E and / Library / StagedExtensions and the only result I find is in /System/Library/Extensions/AppleKextExcludeList.kext/Contents/Info.plist

kextutil can not find it:

# kextutil -b
Can not find the extension with the identifier

Apparently, it's in the pre-linked kernel:

$ grep -rni bwstor / System / Library / PrelinkedKernels /
Binary file / System / Library / PrelinkedKernels // is a kernel prelinked
Binary file / System / Library / PrelinkedKernels // immutablekernel matches

So I try to rebuild like this:

# kextcache -system-prelinked-kernel
KernelCache ID: 589C15EF68C8CF9D1C456F8C5E809F74
# kextcache -prelinked-kernel
Kxld[]: The following symbols are not resolved for this kext:
Kxld[]: AtiPowerPlayInterface :: createPowerPlayServiceFor (PowerPlayCallbacks *)
The link failed (error code 5).
Preliminary binding failed for; omit pre-bound kernel.
KernelCache ID: B8572AE0865E63FD3CE5E2A9014CEA6A

This error does not seem related, but I still get more details:

# kextutil -b
Disabling KextAudit: SIP is disabled
(kernel) kxld[]: The following symbols are not resolved for this kext:
(kernel) kxld[]: __ZN21AtiPowerPlayInterface25createPowerPlayServiceForEP18PowerPlayCallbacks
(kernel) Unable to load kext - link failed.
(kernel) Unable to load executable file for kext
(kernel) Failed to load Kext (0xdc008016).
(kernel) Can not load kext (error 0xdc008016).
Failed to load /System/Library/Extensions/AMDRadeonX6000HWServices.kext/Contents/PlugIns/AMDRadeonX6000HWLibs.kext - link error (libkern / kext).
Check the library statements for your kext with kextlibs (8).
# kextlibs -undef-symbols /System/Library/Extensions/AMDRadeonX6000HWServices.kext/Contents/PlugIns/AMDRadeonX6000HWLibs.kext/
For all architectures: = 2.9 = 1.0 = 1.0 = 1.0 = 1.0 = 1.0 = 1.0 = 1.0 = 1.0 = 1.0 = 1.0 = 1.0 = 1.0 = 18.2 = 18.2 = 18.2

For x86_64:
Several symbols found in 1 libraries:

I do not understand why rebuilding the kernel cache does not solve the problem. I'm running Mojave 10.14.3 on a MacPro6.1. SIP is disabled and I use the @ terminalque fix to use an external Radeon Vega64 graphics processor.