Presumptively, he meant in terms of an old partial tube he already had from previous work. Otherwise, this is most def not a good sign --- LMAO!
It's not electrically conductive, but it is heat conductive:
Arctic Silver Incorporated - Céramique 2
Extract on coverage of small tube:
A 3.5 gram syringe contains enough compound to cover at least 15 to 25 small CPU cores, or 6 to 10 large CPU cores, or 2 to 5 heat plates. At a layer 0.003" thick, the 3.5 gram syringe will cover approximately 16 square inches.