QUESTION - Is this art safe to use???

QUESTION - Is this art safe to use???

Hello.  While I have known OpenGameArt for a while, I just recently (finally) decided to sign up, so I'm sort of a newbie here and please forgive me if this is the wrong forum to ask this.

 

Is this art safe to use?  https://opengameart.org/content/hd-multi-layer-parallex-background-sampl...   It says Licenses CC0 but then the poster goes on talking about Glitch and Glitch Assets (I'm not familiar with it) and, well, yeah, I kinda like the images for backgrounds, problem is, not sure if these images can be used in my own games without Copyright issues.  Don't want to use some art to later find out it is actually from a commercial Nintendo game or wathever I didn't know about before...