That'll be the death of it, I think.
I've been fooling around with alberta's for two years now. None of them died, even though they should have. I believe part of the reason why they made it, is because they had buds everywhere. The shoots seem to have restored the roots, to some extent.
I don't know if that works the other way around as well. The roots on yours were left untouched, so it might be possible! You might want to leave some more buds next time. Working back is easier if there's stuff to cut down. It's pretty hard to stick it back on. ;-)
Make sure you really check the root base on these. You're from a different side of the globe, but over here they're container grown. That means the roots coil up and do things that prevent them from ever fitting into a regular bonsai pot, since it's basically a taproot that turned into an extended trunk. I had a few that I spent hours, maybe days on.. And those turned out to be the coiled-root ones. They were good fire starters.