They can’t modify webkit on ios. They also don’t appear to contribute upstream. So it’s just not supported.
Because it sounds like uBlock Origin works on iOS, when in reality it doesn’t and probably won‘t in the forseeable future.
uBlock Origin never claimed their Firefox extension works in Orion. So I don't think they need to respond.
Instead I'd like a reply from the Orion PM, because they are the ones throwing around seemingly misleading claims about their product.