An immature UBI probably doesn't eliminate all means testing, it just increases from $0 the support level below which benefits aren't subject to a means test; which has similar but reduced benefits in terms of incentives (but lower cost) than full replacement of means-tested programs.

And, it's a pilot, not even the main study.

> The pilot seems to be just piling UBI onto people's existing federal/state/local welfare checks.

I think that's a misreading; it sounds like they did work to avoid beneficiaries losing non-cash aid like housing subsidies and food assistance, but it doesn't sound like (for people eligible to cash aid) they did anything to protect that, so the income would seem to reduce such benefits the same as other outside income would. (Which probably wipes out General Assistance eligibility, but might leave some TANF eligibility.)

> And additionally the pilot is giving it to people not already on welfare.

That's what the U in UBI is all about.