Stock price when the opinion was issued
Nothing wrong with this, but he tends not to write calls on something that's high volatility (like commodities or the Mag 7). Writing calls on something that's volatile severely limits your upside potential, but doesn't protect you that much on the downside. You're not getting much income relative to the risk. Real options traders like this, however, because the premiums on the options are so rich.
What he wants in his covered call strategy are dividend payers, and a more conservative approach.