I also tried running a Radeon Polaris Pro Duo (dual WX-7100) and got nothing when running the tool... I'm obviously doing something wrong or this uncommon gpu just isn't supported, which wouldn't be too surprising. Thought it might be worth a try, simply because like your gpu bios mods aren't particularly practical with this guy and are fairly non-existent on the web.
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I've done some debug of the code for my card....
The card is recognized as an ATI and amdgpu_regs is read
555                     snprintf(buffer, sizeof(buffer)-1, "/sys/kernel/debug/dri/%d/amdgpu_regs", instance);

but when the program try to identify the memory type, all the defined value in the buffer are wrong:

574                             lseek(gpu->mmio, MC_SEQ_RAS_TIMING, SEEK_SET);
(gdb) p lseek(gpu->mmio, MC_SEQ_RAS_TIMING, SEEK_SET)
No symbol "MC_SEQ_RAS_TIMING" in current context.
No symbol "MC_SEQ_CAS_TIMING" in current context.
No symbol "MC_SEQ_MISC_TIMING" in current context.
etc. etc..

Simply the values in the amdgpu_regs are not as expected.
Every time I try to analize those values and correct them, my server crash an reset  

I was thinking the problem where in the driver, but if you got the same result with a wx-7100 the problem could be in the bios itself...
Surely I'm too tired tonight to try again, I will let you know if I can go further...

Bye