Whereas the CPUs and similar ASICs of the 1970s had their transistors ... their PMOS and NMOS components within the BiCMOS process can be readily identified and their structure reverse-engineered.

There is technically no such thing as a single CMOS "transistor." CMOS "gates," CMOS "logic" or CMOS "circuits" are more accurate terms, because CMOS technology is made up of NMOS and PMOS ...