It is peg, not keg. Peg refers to an order where the limit price is automatically adjusted to some benchmark. For instance, you always want to be 1 penny away from the best bid. I don't know specifically what "power peg" is, though.
Also "power" not "powder"
A Freudian flip?
I seem to have misread, but not in a way that markedly distorts things.
"Powder Keg" is a very marked distortion of "Power Peg".
In the context of this story though, it's very apposite. I did the same thing. Quite disappointed after I read it correctly.
Considering how it blew up the company, it's an apt misreading.