This was back in Sept/Oct. and at the time GME was the most shorted stock on the market. He looked at data showing how the stock price shot up each time a new version of X-Box or Play Station came out, so that was what he was presenting to his future Goldman boss.
His projections were that GME would double in price and his now boss said that his work was the best he'd seen in years.
He bought 2,000 shares at $4.16 and sold 1,000 at $7.90 but still has 1,000 riding with todays ~$28.18.
Smart man, and he got hired.