Two different groups, my dude. 2010's S14, informally "Sich", dissolved and then reformed under a different name. The Sich Battalion self-describes itself as named after the Sich Riflemen.
Let's just not let that inconvenient fact they were both created by Svoboda and have the same leaders confuse us. "Foundation for the Future" is to what S14 "rebranded", as
the youth "activist" wing of Svoboda. They can call themselves Mary, Queen of Scots, for all it matters, they're still fucking neo-Nazis.
"They clearly can't be Nazis, they're only
roughly analogous to the Hitler Youth! Theyre the, uh, Stepan Bandera youth!"
Backronym... okay, I'm starting to think the point has flown over your head.
No, you may rest entirely assured nothing has "flown over" my head. You're just openly caping for Nazis at this point because the BBC told you to, and don't want to admit it.
The point being that a hundred years before either S14 or the Sich Battalion ever existed, there were Sich societies set up around the world, many of them by the Radical Socialist Party. And the neo-Nazi paramilitaries of today have pretty much fuck-all to do with them. So when you sarcastically said "Oh and I bet you believe the Sich Battalion and the Sich movement are unrelated too!", you were ironically using an example where... paramilitaries and a wider movement actually did both share a name despite being utterly unrelated.
See earlier point about how Nazis would never,
ever culturally appropriate to legitimize themselves, and weasel their way into popular support by performance and optics.