I don't think they ever put out a formal statement (I'd love to be corrected on this). What I do remember is Palmer Luckey saying that, but then, it's really on the Oculus community to have believed the words of a 22 year old about to make millions.
Facebook kept the promise(in airbquotes) though. Whoever behind Palmer’s Reddit account said he _personally_ assure that _Rift_ remains usable forever without an account, IIRC.