I don't think I really agree with this article.
Most things regarding photography mentioned in the article are still important and relevant. There's no death of landscape orientation, just that our primary displays for looking at photos mostly posted on social media are portrait. However the rule of thirds still applies regardless of whether you use a mobile phone or a DSLR.
Anyone can pick up a mobile phone and take a photo or a video, but the fundamental rules of photography and videography still apply if you want to do things seriously and properly. The article talks about manipulation
Yes its easier to pick up a mobile phone and take a good photo compared to picking up a DSLR. But that doesn't mean the fundamentals aren't important in making both of those devices take incredible photos.
Lastly, the article acts like decades ago photographers weren't taking photos with their DSLR's all dialed and dropping them into photoshop to retouch photos.