The article does not make it clear whether this income is a replacement for all other government-supplied benefits of any kind. The theory of the guaranteed basic income is that it would replace all other programs (and all the employees that administer them.) However, unless there are no other government programs, no matter how bad the individual outcomes are, then all you’d get is an extra handout on top of the mess that’s already there.
Didn’t Milton Friedman support something like this? That is, if you’re going to have government payouts anyway, just give people a sum and let them use it “how they see best”, vs. giving them X for housing, X for food, etc. IOW cut out all the departments and let people make their own choices how to spend the money.