What is happening with Youtube's music videos?

I recently stumbled upon a series of videos uploaded to youtube which are mainly reuploads of older music videos, the first one I saw was "Just Dance" by Lady Gaga, which the title said, and I quote; "Lady Gaga - Replacement for Just Dance" The description was even weirder, which just said "Music video by Lady Gaga performing Replacement for Just Dance" as if the replacement was a song itself, this happened with other music videos, like Hollaback Girl by Gwen Stefani, Sweating Bullets by Megadeth, and more, all these "replacements" were uploaded by the actual, official accounts of the artists, so I don't really think it's a hack, what do you think?