My response to any supposed warning is to abide always in Jesus walking always in the Spirit as one of His sheep:
"To him the porter openeth; and the sheep hear his voice: and he calleth his own sheep by name, and leadeth them out.
And when he putteth forth his own sheep, he goeth before them, and the sheep follow him: for they know his voice.
And a stranger will they not follow, but will flee from him: for they know not the voice of strangers." John 10:3-5
As to the video of the OP, I watched it in part and then skimmed hoping to hear the man's words, but I could not make out what he was saying because the music in the background. I guess that means it was the voice of a stranger.