I have been trying to locate this clip as well. It seems nowhere to be found online except for a couple sites where you need to purchase download credits with Japanese currency. I know I had it on a drive I lost several years ago (RIP).
Some of the threads in the Junior Idol section still have a lot of images in them. Rei, for example, has 90 pages in her thread with tons of uploaded sets still intact.
I honestly can't stand using chat apps like Discord or this Matrix stuff for content sharing. All due respect to those who are making them in hopes to keep some semblance of a community, but it just doesn't feel remotely the same as something like a message board with a search function and...