people without disposable income are now excluded

The article does say/link:

I’ve previously talked about how it may not always be ethical to require people to bet on their beliefs, and talked about how the interests of rich people could bias certain prediction markets

As for

The bullshit artist prevention also doesnt work

In the footnote it does say:

This doesn’t work for very longterm bets, and it also wouldn’t convince everyone, since conspiracy theorists still exist. Still, I expect it to be helpful on average.

Although there’s likely still an overestimation of how much it would help