They are playing with numbers. In 2010 10,000 bitcoin’s were not “worth” $60,000 each. Bitcoins were under $2 until 2011 while still a lot for a couple of pizzas it was a publicity stunt. What they are saying is if the pizza maker held on to those bitcoin’s they could trade them today for.$60,000 each not $2 bucks or less.
https://www.investopedia.com/articles/forex/121815/bitcoins-price-history.asp