The "D"? That might be misdirection, as the "I" is said to be quite huge. (They took out a $13B loan, and Bloomberg estimated their interest at $1B/year. That's a massive chunk of their revenue.)
I wasn't reading "the D is quite big" as Musk actually talking about "Depreciation". I was reading it as another kind of "D".
If you dig into EBITDA in general, you'll find that is one of its biggest criticisms - that it is often used as distraction to make profits sound better than they really are.