Took a while to track down the creator: They are "flexasaurus rex" on that other site (which I won't link to). The link on the info page points to an old, deactivated account.

This is incredible. An MTV simulator with almost 30,000 videos, organized by decade along with special sections for Headbanger's Ball and Yo! MTV Raps.

https://wantmymtv.vercel.app/