I'm absolutely abysmal at even basic math (arithmetic, algebra), let alone anything involved in theoretical physics, but I've never had any issue understanding that channel because as far as I can remember, they don't actually bring up any equations or other math. Maybe there are some math-y episodes I haven't seen, dunno, but I was under the impression it was targeted at laymen and designed to be as accessible as possible, like many PBS things. I've learned a ton from it and have never felt they went too advanced for regular people.
Now, minutephysics or 3blue1brown? Love their videos, but most of them go way over my head. I find PBS Space Time exponentially easier to follow than minutephysics. Just saying this in case anyone anyone were to otherwise be discouraged from checking it out.