The accessibility statement on the Sing Out! site now mentions RTF, not PDF. There is quite a difference. PDF is a "container" format - it is quite possible to create a PDF file which contains only an embedded graphic, which no screen reader has a prayer of working with (and I've seen that done by folk festival publicity agents).

RTF is better, but can still be screwed up so a screen reader can't handle it - it's not an open standard so there can be all sorts of incompatibilities. You can only know if you've got it right by actually testing it, which from the accessibility statement on the Sing Out! site, it seems they have not done.

I haven't seen the magazine for a long time. I'm inferring Sing Out!'s attitude to the blind from what I see on their website, which is about as inaccessible as it possible to get. Greg may well have a bug up his ass, but that website represents a determined effort to prove him right.