This guy who is already independently wealthy chose working 16-17h 7 days a week instead of raising his newborn child and thanks his partner for “childcare duties”. Pretty much tells you everything you need to know.
Being passionate about something and giving yourself to a project can be amazing, but you need to have the bandwidth to do it without the people you care about suffering because of that choice.
i.e. Silicon Valley "grind culture".
As for caring for a newborn, that is the least impactful moment you have with your kids.
Seems like he made a reasonable trade-off and will be there for all their formative years.