The Never Ending Pool

It's worth reading the whole LA Times article to get a context for the quote.
Joni didn't just ring up a reporter to give that quote and then hang up.
The interview was provoked by a drag artist who's been performing Joni's songs and persona in a one (wo)man show so much of the interview revolves around the extent to which identity is performed and how it changes over time. This is one of the reasons why bob appealed as a subject to Todd Haynes. She also says in the interview:
"I'm a method actress in my songs".
Her work has often been overtly confessional, bob's has rarely been so. I'm not so sure she thinks bobs deceptiveness is a bad quality - with her knowledge of visual art she'd be aware of the Picasso quote that 'Art is the lie that tells the truth'.