Hey who gives a monkeys what it is called if you like it and wanna listen/play /sing/it ?
I have not heard the album in the original posting.
But if the man himself thinks it is folk or the people who listen and buy it do then great.
As to the piano jibe well each to his/her own.
I suspect that the term "Folk" was originally applied as a derogatory term by those rather silly people who think that by describing themselves as lovers of high art they are making themselves sound more important.