You will want to download a Knoppix v8.6.1 or v9.x DVD .iso file with "EN" in the name for "ENglish". Use the downloaded .iso file as a source for Etcher (Mac/Windows/Linux) which will create the bootable Knoppix USB stick. Option Boot the USB stick and select the orange icon labeled "EFI". While Knoppix is booting the Mac may appear to be frozen on the Apple boot picker menu so make sure to give Knoppix lots of time to finish booting.
When Knoppix reaches the desktop, click the "Start" menu icon on the lower left corner of the Taskbar and navigate the menus to "System Tools --> GSmartControl". Within the GSmartControl app double-click on the icon for the laptop's internal SSD if it shows up in order to access the SSD's health information. Post the complete report here.
If you don't see an icon for the laptop's internal SSD within the GSmartControl app, then we try the following options. You will need to launch one of the terminal apps (there are several available on the menus), but I believe there is an icon on the Taskbar near the "Start" menu for easy access. Try these commands to see if the SSD is seen (feel free to post pictures of the results).
To look for block devices like an SSD and other drives:
sudo lsblk -f
This command will filter the system log to hopefully see if the SSD is communicating at all (I haven't done this in a long while with Knoppix so I'm not sure if it will work properly):
sudo dmesg -Hkt | grep -iE '^ata|^scsi|^ahci|^sd|^nvme'
If Knoppix only boots to a command line, then I can provide instructions for checking the health of the SSD using another method if these two commands show the SSD is present.