Channel containing possibly lost Nickelodeon Bumpers?

I need some help identifying some Nickelodeon bumpers from a channel known as "bumpromofest" on YouTube. Here's the channel. A lot of the Nick bumpers are 5-7 years old. Their last post was 4 months ago, so I might contact them about the bumpers and why they posted them. However, I have seen that bumpromofest has actually taken some hiatuses throughout their career; first, a two-year hiatus in 2017, and then another two-year hiatus in 2019. I warn that another hiatus could take place, which would lead to the inability to contact them.