I believe he was talking about the Gen 2 not the LCP II the Gen 2 was made available around 2013 as the custom then also did the same internal changes with the regular LCP which gave it some bigger sites while still small and a better trigger but still didn't have the slide lock on the last round
If you compare the 2 guns after fully pulling back the slide, you will see the hammer on the Gen 1 is in the 1/2 cock position. On the gen 2, the hammer is fully cocked and all the way to the rear.
I believe there is an extra notch on the seer of the 2. If the gun is dropped and the hammer moves, the extra notch will catch the hammer. This is a drop safety.