The article says, "While other CPUs from the same era used microcode to interpret the instruction, the 6502 had this 130×21 bit PLA." The 8080 and Z80 did not

The article says, "While other CPUs from the same era used microcode to interpret the instruction, the 6502 had this 130×21 bit PLA." The 8080 and Z80 did not use microcode; it was all ad-hoc random logic.