“guaranteed income” or “guaranteed minimum income” is not “unconditional basic income”; the former is often a name for a means-tested program tha provides an income floor, but not necessarily a boost beyond that floor.

OTOH, nothing in the article or the linked article I checked suggests this is means tested, its background tested (currebt foster youth originally, former foster youth for the new expansion), self-selected (application required), and randomly selected from the eligible applicants.