Well, technically, he did answer. He was synthetic, and now he's very much organic. Really, it's exactly the kind of fully accurate but potentially frustratingly ambiguous answer Faust should probably get used to if he plans to hang around Epsilon or Ginko.

So far as he knows, Epsilon is entirely organic now - but that's not really his to answer. So, instead, he just adds, "If you aren't sure, we might want to err on the side of caution. Just keeping the split part of the vine bound together should help if we can't do anything else."

Yes, he knows Epsilon already said it may heal on his own. No, he does not want to risk leaving it totally untreated.