And why is it Confirmation Bias as well ? Or are you just trying to make yourself look clever (and failing).
Presumably it's confirmation bias because she remembers the time she found something and would be ignorant of all the times she didn't. Besides, claiming to have "diagnosed cancer" is amazingly arrogant unless chiropractors have started performing biopsies now; surely what happened is she found a lump and advised to get it checked out?
But yeah. It's more of a - what's the opposite of a straw man? It's a little positive anecdote about chiropractic which, when you actually look at it, is nothing to do with chiropractic at all. Suzy at the beauty salon might as easily have gone "ooh, that's a strange lump, you've better go see a doctor" when she's slapping on some fake tan; that doesn't mean we should start going to beauty parlours with our bad backs.
Am I wrong? What's the conclusion we're expected to draw from that story, that chiropractic is efficacious in detecting cancer now? At best it's a little disingenuous.