As the press release slightly revised into "breaking news" said, how long immunity lasts is a question. But it's clear that at least for most people antibodies confer immunity.
Why? Because at least in S. Korea, in hundreds of cases where reinfection was suspected there were no (count them, "no"
live virions. It's still possible that just maybe it was a giant fluke--that all those people just happened to be retested for some reason, test positive, and have no actual recent exposure. It's looking very much like that's not the case, but weirder things have been known to happen. "Highly improbable" does not mean "impossible." We just round at 5 or 6 decimal places and figure that things that highly improbable happen so seldom that the distinction isn't one to be drawn.
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