If I am often sceptical of the odd song sung by source singers I'm sure as hell not going to get excited about a singular piece sung by one revival singer. It doesn't occur in any of my indexes, but that's because it wasn't published in print in a reliable anthology.

Interesting discussion though, but surely not worth spending too much time on. Once I know someone is an inveterate fabricator all of their work becomes worthless in terms of authenticity, but like you I am fascinated by the fabricators, all of them. In particular their motives.