I was curious of what were the odds, so I calculated them. Assumed he played for 7 hours at 1 hand per minute at £150,000 stake and a hand is like a coinflip, the chances are:
Win 10 hands or more than average (£1,500,000 win or better): ~18%
Win 20 hands or more than average (£3,000,000 win or better): ~2,8%
Win 30 hands or more than average (£4,500,000 win or better): ~0,19%
Win 40 hands or more than average (£6,000,000 win or better): ~0.0055%
Win 50 hands or more than average (£7,500,000 win or better): ~0.000061%
I should correct this post: The amount won is wrong, since by winning 10
hands more than average you win 20 hands more than you lose, so it's double than that. Everything else is (hopefully) right. The fixed stats are:
Win 10 hands or more than average (£3,000,000 win or better): ~18%
Win 20 hands or more than average (£6,000,000 win or better): ~2,8%
(Win 25 hands more than average (£7,500,000 win or better): ~0.84%)
Win 30 hands or more than average (£9,000,000 win or better): ~0,19%
Win 40 hands or more than average (£12,000,000 win or better): ~0.0055%
Win 50 hands or more than average (£15,000,000 win or better): ~0.000061%
Which increases the chances from almost impossible to improbable. Sorry if someone has been mislead because of this