I don't get why people keep saying that. We have no indication that Ice Magic is easier to 'translate' than Hag or Hedge magic. It's weird and alien to Mathilde's understanding of magic, but so is any other non-Teclisian magical tradition.
Since we don't have the coin turned to the Father, our only in with the local Hedgewise is Kurtis' recommendation. Trusting someone on the word of a friend is one thing, trusting someone on the word of a friend's friend is another. It might be that the Hedgewise being willing to say that we're probably not terrible to the Hags and that will probably be good enough, but I can certainly see the Hedgewise not feeling comfortable vouching for us to the Hags.
If anything I think Ice magic is the harder to translate, they use a 'wind' that seems to be localized with Kislev, by contrast the Hags deal with spirits, that is within the framework of Teclisian theory... granted it is within the theory for deamonology, but we at least have apparition binding to fall back on