it was just about him saying about the employability that striked me as odd
PHP is still the most widespread used of the back end web languages and it's popularity is yet to wain. In fact, I would say that the language, community and job prospects (for quality devs) are still very much on the rise. The reason you don't hear that much about it, is because it has been on top for a long, long time.
There is plenty of exciting stuff happening outside of the world of PHP, but there are also plenty happening within it. No harm (at all) in learning a new language/technology though.