I think its because so many of the new artists cite the Beatles as an inspiration of theirs, so it does connect.
As well, compared to the trash today, the Beatles almost seem safe and innocent. And even some serious believers don't see it.
three, there are always new believers who need this rehearsed to them. We may get it, but what about the new Christian who hasn't heard it?
Yes, various artists cite them, and if the article was directed at them, this would make sense.
Yes, new Christians need to learn stuff, but far more important to disciple them than to talk about the Beatles, who they likely either don't know or don't care about.
Try talking to someone about how Patsy Cline paved the way for Madonna, Lady Gaga, Katy Perry and see the blank look on their face.
As I said, there is an audience for this message but it's a rather specific and limited audience that this will likely not be reaching.