Review Detail of GrandpaPeng in The Lord of Void and Real

I am a little more than halfway through the novel. It's one of the rare novels where MC travels to future during the story. It started to pick up after first 100 "normal" chapters, got boring after 600. It got interesting at like 900+ again, but then came a weird plot moment. I am thoroughly confused. The future route seems to be finished so early, MC's "cheat" shatters, that would be OK, but then he is not brought back to the point before pulled to the future, but with a sudden 100 year time skip. And that's where the plot feels weird and confusing. All of sudden devil reincarnations are thrown out of the window, what MC promised (look for someone) is not mentioned, his longevity is not mentioned and we get that illogical competition. Uhh. A mood killer. I'd love to get an explanation but can't find spoiler reviews.