And there's nothing wrong with that. It's pretty good that they stated their beliefs upfront, so at least we can see where the bias (if any) comes from.
Separately, every institute or person that has published anything has an agenda; so the fact that this particular institute has a mission that you perceive to align with their words doesn't mean that their words are wrong. It is by definition an ad hominem fallacy.
A child of a poor single mother, Barack Obama, made his way to the highest office of the land (not to mention significant personal wealth), whereas a child of a billionaire, John du Pont, died in prison as a convicted murderer. Both had equal opportunities to make something of themselves in a cultural, legal, and economic framework that values the individual.
In this land of equality of opportunity, 93% of people born to parents in the bottom quintile of incomes ended up earning more than their parents, with 57% ending up in a higher quintile; and a full 60% of people born to parents in the top quintile of incomes ended up in a lower quintile[0].
Meanwhile, in Norway, famed for its egalitarian attitudes and highly redistributive policies, a higher percentage were able to climb out of the bottom quintile, but a similar percentage held on to their parents' top-quintile ranking[1]. The country has more billionaires per capita than the US, and still has a legally separate and privileged group of people, the monarchy, who by definition are unequal from the rest of the populace; and it's only a few generations removed from having legal privileges for the aristocracy.
[0]: https://www.pewtrusts.org/~/media/legacy/uploadedfiles/pcs_a...
[1]: https://www.brookings.edu/wp-content/uploads/2016/07/02_econ...
If this is to be achieved it is going to require a lot of money.
We are a long way from having a child growing up in social housing sharing the same opportunities as a billionaires child.