hard drive – Kernel_task running 100%+ which is throttling the MacBook Air

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 when 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