It sounds like somebody got audio of AXL ROSE practicing with AC/DC for their upcoming shows. There are two, 30-second clips of Axl belting out “Shoot to Thrill” and “Thunderstruck”.
They appear to have been recorded outside a studio, so the sound isn’t great, but it’s hard to deny that’s Axl’s voice.
The title of one of the videos is in Spanish, and it mentions Lisbon. That’s where the first Axl-DC show goes down this Saturday, so we assume that’s where these videos were shot.