Here is a quick explanation of how markets work, and why equity is the wrong thing to look at to answer the question asked.
Equity prices give you a share in future success. They therefore predict expected future value, pro-rated by the odds of getting there.
Bonds give you back money if the company remains in business, and nothing more. Therefore they represent a prediction of odds of going out of business, with no regard to how wonderful the possible upside in the company might be.
Tesla's combination of high equity value and low bond value represents a company that has a real chance of becoming dominant in its sector, and also a good chance of cratering instead. You shouldn't invest in a company like that unless you understand why there is a real risk, and are willing to take it.