I'm not sure that aggressive timeline Musk mentioned - about 4 years before sending an (unmanned) Mars mission (with Starships involved, as I understand), or ab

I'm not sure that aggressive timeline Musk mentioned - about 4 years before sending an (unmanned) Mars mission (with Starships involved, as I understand), or about 10 years before that kind of a conference - a room for some ~100 people - can happen in space. But the large milestones themselves - making a heavy rocket (Falcon-9), making an even heavier rocket (Falcon Heavy), launching unmanned and manned spacecrafts to ISS (Dragon and Crew Dragon), landing first stages of rockets for further reuse, launching a world-wide ISP - they are all eventually achieved, and "eventually" here still means "very fast by classical space industry standards". And we're not yet talking about money here. So... time may easily slip. Milestones - less so.