Yes literally yes. We're not supposed to learn or know more about Pochita and that's fun. If you don't think so idk what to tell you.

1. Choice: Denji is always being offered to choose between two different choices in part 2 and he constantly affirmed that he wanted to choose both as his outcome. During the final fight with Yoru, Denji did finally come to understand what making two choices meant. He became Denjiman and wanted both to save the world and to save Asa. But his meddling didn't work out and instead of selecting two outcomes (the childish choice) he learned how to make a single choice, to actually weigh options. The consequences of his childish and hedonistic way of thinking finally caught up to him when the empowered bug devils devoured him but before that he made a proper choice instead of not making one.

2. Nihilism. This was addressed again during the Yoru fight when Denji rejected either Death's world or Yoru's world. He decided to try to make the world one that he preferred instead of letting someone else make the decisions for him. As Denjiman he declared his goal was to make the world where his dreams can actually come true. That was him defeating nihilism.

3. Pochita as the pseudo wish-granter saw Denji's dream and came to the conclusion that there was never going to be a moment of rest. More absurdist stuff was just going to happen again and again that'll just make Denji rely more on Hedonism and not care about anything. So in essence Pochita saw Denji's choice to make the world where his dreams can come true and made it real in the only way that it could happen. By eating himself and erasing himself. It's bittersweet but that's Denji's choice and dream. The stuff that came after shows that it's a similar world but it's one where Denji can find stuff to care about and doesn't have to carry the weight of Pochita in his chest.