I cannot speak to the PZEV issue as I am not familiar with that, but unless I've read something wrong, the 2018 warranty covers more than those two components although yours and Chevys definition of Major may differ.
What differs is the coverage. The 8/80 on a Cruze covers catalytic converter, engine control module and trans control module. You'll notice on your documents those items have dual asterisks, denoting the 8/80 coverage. That coverage is in all 50 states and Canada(as 130K km)
Everything on that list is covered under bumper to bumper warranty which is 3/36. Which is longer than the Federal 2/24 warranty. Cars registered in California emsissions states get coverage to 3/50 on those items in the list.
Additionally on LE2 cars in Cali Emission states the intercooler is covered for 7/70.
LH7(CTD) cars also get the intercooler covered as well as the Charge Air Bypass Regulator Solenoid Valve Vacuum Tube.
Long story short....That list isn't as impressive as it seems at first blush when you understand the warranties our cars actually have. (Though they are far better than the 12month/12k mile warranties of the 80s and earlier.)