Material in this sense means that it has relevance to the share price of the stock. Tesla's Model 3 ramp up schedule is material information. You are right th

Material in this sense means that it has relevance to the share price of the stock. Tesla's Model 3 ramp up schedule is material information. You are right they could have not volunteered it, but since they did they have a duty to ensure it was the most accurate estimate they had at the time of release. If it turns out that they knew or should have known they wouldn't make the schedule then they are liable for misleading investors.