1200 quintillion tons is over 20% the mass of Earth if it were on a scale, well into the planetary range. This, along with doing it one handed, effortlessly, would certainly increase his chances of succeeding here.
Of course, this is high end way to view it. The moon base facility that was conducting the strength test seemed to be replicating normal earth gravity, which brings it back to square one. Brought it up just in case however.