I'm betting it was correct. I know guitar fingerpickers who call weekly application of new fingernails of some kind of swell plastic a business expense. The technique looked like a guitar rasqueado similar to flamenco technique.
But apart from technique- what a great musician and human being! There must be an astonishing gold mine for ethnomusicologists in China:) Thanks for posting the link- I meant to go there after the News Hour to see the additional material, even though by TV news standards it was an epic already (that only takes more than a minute:fifteen).
I can't wait for some great collaboration of Wu Man with, say, Yo Yo Ma, Mark O'Connor and Ry Cooder!
Carter