I hate these sorts of titles, because some of us DO work with petabyte scale datasets. I know the article does mention the types of use cases that Hadoop is good for, but the title just comes across as arrogantly dismissive.
Some of us though, from time to time, have these side company projects. Then ,after a round of consultants and meetings (and nobody asking us for input) we had this 500MB database, and an architect who was pushing for all the big data keyword to be on his resume, even though all math and business numbers said we'd double that in twenty years.
We are talking zookeepers and 20 servers per geo separate datacenter, spark, ml, Casandra, hadoop, MR, java everywhere, logstash, etc etc etc. Presentations in hundreds or PowerPoint slides and endless meetings about direction and future.
So the article, and MySQL, have it's places. Especially when one can finish the job in two weeks.