I planted the ones in the photo in the garden. They also spent the last winter there at -11°C. Most of them survived, but this summer was not good and they hardly recovered and grew very little. Unfortunately, with all citrus the shoots in August are the strongest, in spring the growth is very small. But the late shoots have no chance of surviving the winter.
I still have many seedlings in the greenhouse, I want to plant them out next year. A bit bigger than the last ones.
Overall, most hybrid seedlings have little problem with the winter itself, more with the summers.