It's simple: the Canadiens have too many left-handed defensemen, and too many defensemen overall. However, Arber brings a unique dimension that others cannot.
We know that the Devils' GM has openly mentioned that he's listening to offers for their 10th overall pick in 2024. Hence, this proposal stems from there. The connection is easy to make since the Devils need toughness and defense.
Personally, I don't believe Xhekaj should be traded, and I don't think Kent Hughes wants to trade him either. Not only is he unique, but the organization also drafted his younger brother.
It would be very surprising if they selected Florian and then, a year later, traded the older brother. Besides, considering how Arber was playing before his injury, he deserves a spot in the lineup.