OK, so this works on AMD Jaguar according to the README. That's a architecture from 2013. There's notes about Zen 3 having a different base address for the memory controller registers, but that's it. What newer CPUs does attack actually work on?
You would have first break the firmware or locks before an attack like this on a modern CPU
> Developed and tested on AMD Family 16h CPUs, the last generation whose datasheets document the DRAM controller's translation registers