Which is different than comprehending what you say...I say what I mean, and mean what I say.
I have PMOS and NMOS logic chips in my inventory, so it's safe for me to say that I'm aware of both technologies and that I've used them in my designs. You may call them obsolete, but they still exist in every CMOS device and we couldn't have CMOS without them.Perhaps you are unaware that there were such things as PMOS Logic and NMOS Logic of which actual LSI semiconductors were built. This is the context in which I was writing. Both technologies are now thoroughly obsolete.
Heck, I even personally know some of the people who designed some of the NMOS parts I use...