He is all-in on an expiring weekly. The outcome any particular trade, no matter how robust the edge, is unknown. Proper bank roll management would make that outcome, in any particular instance, unimportant. In this case, the survival of his account through the weekend depends upon a favorable outcome for this one trade. No matter how sound the thesis for the short trade, it is never a good thing to be all-in (unless that was somehow the plan - do perform stunts).
I never implied it was good risk management.

