a. "more likely" doesn't mean it isn't possible to achieve if you aren't "born right"
and perhaps more to the point:
b. "success" is measured on a continuum; it's not a binary proposition. And there's a lot of room between "Becoming a Supreme Court justice" (just to pick an example) and winding up as a barista at Starbucks. Like, plenty of lawyers who make a nice living for their families, or all the thousands of local district and superior court judges out there, or the hundreds of federal circuit judges who don't quite make it to the very top.
This kind of article is boring and pointless because it's selling a dangerous idea: that nothing you do matters at all, and, ergo, you might as well do nothing. I mean, if hard work doesn't matter, why bother working hard to begin with, right?
As the old saying goes: "It is better to shoot for the stars and miss than aim at the gutter and hit it". Or another take on it: "Shoot for the moon. Even if you miss, you'll land among the stars."
So yeah, tell your kids to dream big and work hard. They'll probably go further than if you tell them "life sucks, you have no chance, so just go ahead and do nothing but play video games and smoke weed all day".