Comment by lordmauve

I don't think that is incompatible at all. It's a restatement of the same thing:

If someone is right a lot they are likely not making assertions about things that they know nothing about.

If they are making assertions about a domain and those assertions are correct then that domain is one of their competencies.

"Utterly useless" is a bit extreme but it's a reasonable observation to say it doesn't have predictive power.