But with companies you're not dealing with interest compounding, you're dealing with a company's growth prospects, which are largely unrelated to interest rates.
I've not seen a context where people where strict about saying compound interest is exclusive to interest payments. Reinvested dividends and reinvested earnings also compound.
He isn't saying that you'd have both at the same time. He's saying that high company growth is also compounding. And reinvesting dividends is yet another form.
