[colejohnson66]

That's probably not even correct. Unless they've decapped the chip and reverse engineered the physical transistors (like Visual6502 did), it's not a "transistor level implementation". I have no reason to believe they did so because it wouldn't be reasonable. It's almost certainly an HDL-level implementation.

Unless they're stretching the definition of "transistor level" to mean "we use transistors to simulate the original transistors", but that would also include software emulation that runs on CPUs. It reads like marketing copy written by someone who doesn't even know what an FPGA is.