Kernel_task running 100%+ which is throttling the MacBook Air

[ET1]

Thanks in advance for any and all help. My MacBook Air has come to a crawl because the kernel_task is running at 100%+. I have researched this issue extensively and have decided on following the guide listed here (https://grafxflow.co.uk/blog/mac-os-x/delete-ioplatformpluginfamilykext-macos-big-sur) and accept the risks. The only issue is I can't get past step 3. In particular this step:

Next make it writable which will require you to enter your password - the /Volumes/Macintosh\ HD\ 1 could be different.

sudo mount -uw /Volumes/Macintosh\ HD\ 1
When I enter that command I get the following error. "unknown special file or file system"

FYI Diskutil list shows this in case I picking the wrong disk in previous step

diskutil mount disk1s5
/dev/disk0 (internal, physical):
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *500.3 GB disk0
1: EFI ⁨EFI⁩ 209.7 MB disk0s1
2: Apple_APFS ⁨Container disk1⁩ 500.1 GB disk0s2

/dev/disk1 (synthesized):
#: TYPE NAME SIZE IDENTIFIER
0: APFS Container Scheme - +500.1 GB disk1
Physical Store disk0s2
1: APFS Volume ⁨HD - Data⁩ 152.9 GB disk1s1
2: APFS Volume ⁨Preboot⁩ 282.2 MB disk1s2
3: APFS Volume ⁨Recovery⁩ 622.1 MB disk1s3
4: APFS Volume ⁨VM⁩ 1.1 GB disk1s4
5: APFS Volume ⁨HD⁩ 15.3 GB disk1s5
6: APFS Snapshot ⁨com.apple.os.update-...⁩ 15.3 GB disk1s5s1

 

[Cory Cooper]

Hello and welcome.

It isn't advisable to dig into the macOS System files this way, as you can actually render your Mac unusable.

Per the linked article, had you previously deleted IOPlatformPluginFamily.kext in a previous version of macOS, before this issue started? If not, then there may be something else causing the issue.

C