Its pretty simple actually. The sun composition as you said is indeed accurate. But the density is changing. You see in the core of the sun, there is a lot of pressure. Which causes the hydrogen to get closer together. In the result the hydrogen in the sun core has almost 150 g/cm3 thats almost 15 times denser than lead. So here is your answer.


Ps. The sun mass is 333 000 earths, not 33 000 earths.