A 1,300,000 share short position would require margins of around $3,250,000
BEST case scenario the stock goes to .0000 and he gets to make an 8% return on the capital risked... However that's very unlikely
Upside risk he could possibly lose all 3.25 million or a possible loss of 12.5 times what he could ever possibly make... and then some if there is a squeeze... So really I don't see the point to short but hey it's not my place to tell people what to do.
Everything I say is in my own opinion do not buy sell or hold based off what I have to say.