ElsaGate Channels With Reversed Message And Cryptic Unlisted Video

I found this channels a while ago, while I was making a informative sheet about ElsaGate 2.0.
This is the first channel: https://www.youtube.com/@PizzaCartoon-y8z
The first video is classic ElsaGate, which includes Elsa, Anna, Spiderman and Joker having dinner.
BUT , something strange happens.
From minute 0:46 to minute 0:50, you can see random colors changing.
What the fuck?
But now let's get to the second video.
The second video is ElsaGate 2.0 content.
Pomni and Jax have a relationship, but Ragatha is jealous of them.
From minute 1:49 to minute 1:57, you can hear a reversed voice.
Could you figure out what it says?
But now, the most cryptic channel is this: https://www.youtube.com/@DLCQEKOGYVPCB
The title of the channel is a code.
If you look at the community post of Pizza Cartoon, the previous channel, decrypt the code and it will lead to this: https://youtu.be/vZhRmrmHN24
It is a video where there's some weird audio with a guy looking on a website on his computer.
But the creepiest thing is that he's looking at the previous channel, which means that this guy is behind Pizza Cartoon.
Also, check the description, and you will find some codes, alongside the video's title.
Can someone decrypt the codes and tell me what is going on?
Thank you.