It means he sold the ability for someone to buy his shares at a specific price. E.g. allow someone to buy his shares for $160 each before September 21st.
For that, he gets $9.10 per share.
Of course, if the stock price never goes over $160, nobody is going to take him up on that offer, and he pockets the $9.10, and can do it again. So he just lowered his purchase price per share by $9.10 each.
The downside is, if the price goes to e.g. $180, he would still be forced to sell $160, and would make only $169.10 on the deal (the original $9.10 and the $160).
Covered calls at the money on a volatile stock like Tesla can net you around 7% per month on a volatile stock like Tesla. But you miss out on large upward price movements while still sitting with all the downside risk.
- Deon