The paper states that the results are in vivo, not in vitro. The bacteria seemed to literally have cured colorectal cancer in mice. Mice are apparently strikingly similar to human beings in ways that matter, and so this research is very encouraging.
Likely too late for a particular person in my life, but hopefully not too late for others.
As in 99.9% of cases of people who rush to the comments desperate to post a link to xkcd because, erm, actually I dunno. Why the hell do half the threads on HN have someone desperately posting an unrelated xkcd?