Which brings us back to stripping the cable off ....
Assuming the conductors are individually marked as to the insulation type, there's no violation. Nor is there any requirement that the ground wire be insulated.
However, it's likely that the individual wires are not marked - just the outer jacket. Remove the jacket, remove the listing.
Then there is the matter of aluminum in contact with the earth. Not allowed by code ... but is 'in the pipe' the same as 'in contact with earth?'
