Im not a fan of the semantics used here. Outer rain bands are very much part of a hurricane, just not the core part of the storm.
The outer bands, especially on the northeast quadrant of the storm produces the most tornadoes. When interacting with cold fronts and enough convective available potential energy (CAPE), those embedded storms behave like supercells even though they are away from the core of the hurricane.
So saying that hurricanes can’t produced supercells is not true and true at the same time.