Enterprise Customers cannot (and will not) attempt to transition from hosting hundreds (in some cases, thousands) of private repositories on gitHub in favor of another service.
The alternative would have to aggressively undercut gitHub's enterprise sales model while competing with gitHub's uptime.
Tech Innovation kills existing jobs by replacing 100 humans with one machine, this is true. If you're a cab driver, you may not be ecstatic about self-driving cars.
But those same technological advances invent new goods and services for an ever increasing population. More people are fighting over the same set of resources, which technology allows markets to distribute more efficiently. The new tech creates new demand no one knew was needed (e.g. the mainframe, the internet, mobile web, the blockchain).
While it's tough luck for the 99 workers who are not in a position to learn new skills, the bet is that tech advancing will create more economic opportunities for the next generation (while improving the quality of life) and upgrading society like 'aging up' in Age of Empires or Civilization.
This article is about how he did not make that claim, while media outlets and social media accounts claimed he did.