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"Cyber correspondent Joe Tidy says he didn't know PHP existed until yesterday morning"

He's a journalist. He reports the news including quotes from experts. In the same way as most science is reported. Or most engineering is reported. Here is an article about structural faults in a bridge. I wonder if the article was written by a structural engineer?

He's a correspondent and it's his specific beat, and he's written a book about hacking. I'm shocked he'd not even heard of it before.

Why are you shocked? Are his articles about the vulnerability miles off the mark or something? I imagine you have reported on lots of things where you are able to report but you couldn't be an expert. It is how journalism works. I am confused why his honesty is upsetting people.