Except the video wasn't recorded by the creator of this channel - that person just collects this sort of video and uploads them in the hope he can monetize them.Personally I think the most likely scenario is that he has manafactured this scenario for a YouTube video. The rest of the content on his channel would appear to support this.
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We don't know anything about the person who actually recorded that video, other than it wasn't the person whose channel it appears on.As he's a self appointed "auditor" I am inclined not to believe a single word he says - look at his YouTube channel to see what sort of person he appears to be. I would be totally unsurprised were it not that guy's first encounter with that RPI and so it was just another "here we go again".
I'd read nothing at all into it with regard to Merseyrail's policy.