Someone who enters the country on a H-1B don't necessarily stay in that category for all eternity. Although this is getting harder over time, people can switch

Someone who enters the country on a H-1B don't necessarily stay in that category for all eternity. Although this is getting harder over time, people can switch which visa they're on, for example by applying for an Outstanding Abilities visa (O-1), a green card (EB-1), or even by getting married to a US Citizen (IR-1). The point of the article is that these people were H-1B holders when they moved to the US, and went to become extremely successful later on.