phkk,
I rooted pomegranate cuttings from a neighbor's plant(AL, on the zone 7/8 interface), back when I was about 8; planted two of them at my grandmother's home - 15-25 ft from a young (at that time) black walnut tree, I had no inkling of juglone toxicity at that age.
The poms lived and grew, but did not flower or fruit for over 30 years, until my parents had to have new septic lines installed, and in the process, they trenched between the BW and the poms - almost killed the BW in the process, and it did decline over the next few years and eventually died. But! The poms burst into fruit production almost immediately after the trenching.
So...in my experience, pomegranates and black walnuts are NOT compatible.
Loquats... I have no idea...

Thank you. I just chopped the walnut :(.