I think they threw out the renewal....

False, everything was not taken out entirely. There are some changes, but it's not completely the same as it was when Chapter 3 was renewed in Generation 14.

Yesterday, I have completed Generation 10 on my alternative character. Instead of being required of having level 10 exploration, I needed level 3 exploration, just as it was required in the Generation 17 renewal. Once I reached the final of Generation 10, my mission was advanced difficulty as opposed to intermediate, but there was no part 2 of the battle, just a Life Drain on the Doppleganger and the fight has ended, Nao thanked me and the credits rolled.

I believe that most of the generations (9~16) now are based on your total level again, but I am unsure if the rewards from the renewal are still with us. Once I get past Generation 13, I'll report back.

Regardless, I'm infuriated how Nexon are lacking with their patch notes department, letting their players know what exactly changed, and how nobody in the community seems to care about it.