Even if there is a registered company Dream uses for his financials through the business, this is a very personal info and we aren’t entitled to know it.
If it’s really a concern for you astrologically… better to just test the waters. Try a few fields that you think can help you and see it they do work for you. If they do seem to make a positive difference in your life then you are astrologically aligned to his fields otherwise you can make your choice to continue or not.
And I have studied both sidereal and tropical astrology… and now have stopped using any of those. Astrology doesn’t work in black and white like this. Don’t read too much into it… it’s too complex anyway