I heard that this tubers can successfully overwinter using this technique, though I haven't tried it myself.

I would be interested if somebody has tried this as well.
I have done this for cannas for a few years without a problem.
I have a bunch of dinnerplates, some of which I am going to leave in the pots. I use bark based mix which drains very well.

For over 20 winters, we have had some in pots, and just put the pots with soil and tubers, foliage cut off, in our drywell of the basement windows. Hubby has the drywell or window well, whatever you want to call them, covered with wood. Keeps it dark, and the window well is made of concrete block, which seems to keep them from freezing. In all these yrs. only lost a few tubers. Some we have in a patch, we leave in the ground, zone 7. We remove the stems, and cover the patch with that blue plastic stuff. They come back every year, but protecting them from water going down the hollow stems seems to be the answer, besides keeping them from freezing.
Darlene