That was quite the rabbit hole, I had no idea a global cabal of neonazi "Satanists" was spawned in Shropshire back in the late 1960s. I poked around Amazon and you can still currently purchase their books, which look completely ridiculous but have mostly positive reviews.
A metric fuckton of weird magical societies were created in the UK in the 60s/70s. It was kind of the hotbed of modern occultism.
For the O9A i had no idea they were neonazis, but they've always been considered edgy teenage satanists by the community. To be fair i thought they had died down a couple decades ago.
With the sheer amount of books they have on record, it's pretty much impossible to vet them all. So I'm not terribly surprised some nazis snuck some in. I am, however, disappointed that some retailers didn't immediately yank them out of stock. Honestly, I wouldn't be entirely surprised to see a version of The Turner Diaries on some of those sites. They really don't give a shit.