It doesn't matter who Blondey's parents are he got on Adidas and Palace because people saw his skating and liked his general demeanor. This isn't Tennis or Polo or some shit where the quality of your country club membership has a direct correlation to the opportunities you have.
I don't know how Thames is funded, but if he's bringing in Palace to help run it then it's definitely not his parents, who would likely want to put non skaters in there somewhere to not waste the profit.
He also talked about how he went to a fancy school and used to ditch school to skate South Bank in his uniform. He's not hiding shit. Like him or not the dude is himself.
*I myself did not grow up with rich parents or care much about Blondey but I found parts of this episode really candid and interesting.