Poker is intensely psychologically draining and the biggest enemy of winning poker players is tilt. http://en.wikipedia.org/wiki/Tilt_%28poker%29
Most good players will constantly asses their play for signs of tilt and when they spot it, stop and take steps to address it before continuing.
Obviously there's a huge difference between $10 and a few hundred thousand dollars, but the same core concepts apply. It's difficult for people who haven't played a decent bit of poker (even at very low stakes) to understand how psychologically draining it can be, and how much the player's frame of mind affects the game.
a) you have a significant and consistent edge over most other high stakes players (Tom Dwan, Brian Townsend, Patrick Antonius, etc.),
b) those players would be fooled repeatedly by bait and switching without adjusting their game, and
c) you could run such a strategy successfully without having ever played those players at those stakes online before.
Additionally, luck still plays a huge role in the short term no matter how skillful you are. You can't bluff/draw every hand and win over the long term. I can't lose to you for thousands of hands and then suddenly flip a switch and make it up in one hand. This is where/why the pool/golf/prop etc hustles work.
Poker is really about the long term unless you go on a short streak (such as perhaps Isil did) and get out. Otherwise the skill factor will eventually kick in; Even if it takes 1million+ hands before you can even start talking about the "long term" there is no real way to hustle anyone over that amount of hands. Poker wisdom is: "The long term is REALLY REALLY long."
The bit where the writer said Isildur went "brb" and came back and won from then made me think he brought some other force into play, either a companion, a hack or a bot.