Really unfortunate that it pitches php development as a way to get started as an older developer. As if an older developer doesn't already feel antiquated and behind, let's make it worse by teaching them an established technology that is not usually the language of choice for companies on the bleeding edge of technology, which i, I imagine, where these people are hoping to be
I'm not sure that's really a problem; if anything, it might be a smart move. PHP due to its large installed base, might become the legacy software niche similar to COBOL. While the younger generation might not want to touch it, older developers might have no problem with it - provided such opportunities are still available.
