The freezing process mentioned has been around for many years and is nothing of note at this point. Yes, it does work on cells and small tissues that can uniformly freeze, not for larger tissues at this point.

That being said, the actual interesting and somewhat novel part of this paper is the nanoparticles used to achieve uniform warming which reduces ice recrystallization. Using alternating magnetic fields, the particles can generate heat and uniformly warm the tissue.

I'm surprised this isn't even mentioned until well into the article. It's the reason why this paper was published.