It's a Tonebender inspired fuzz. Sounds good so far!
I think they mean the hard-to-find parts'Endangered'?
70 years ago there was no such thing (i.e. extinct). 50 years ago, there was probably less than a half dozen manufacturers of fuzz pedals. A decade later, maybe 20 builders. Now there's like a zillion and fourteen fuzz builders. I think that's quite the opposite of 'endangered', no?