The text you quoted doesn't appear on the linked page. I see the following if I click "Load more":
Having a great idea or being a charismatic visionary leader is “time telling”; building a company that can prosper far beyond the presence of any single leader and through multiple product life cycles is “clock building".
Having one idea is like telling time "It's 9:38." You know what time it is in that moment, but that moment passes.
Having a company is having a clock. You always know what time it is as long as the clock exists.