My nephews raced MTB all the way through HS, and routinely ran 15-20psi in the front and 20-25psi rear (depending on the tire and conditions) on tubeless 29ers. I've run tubeless 700x38 CX/gravel tires at 40psi, and I weigh 210lbs. I don't rely on a goddamn online calculator to set my tire pressures. I go by what works.

Tubed pressures ≠ tubeless pressures