The article is somewhat confusingly written (or maybe I was just confused by "killing it" colloquially meaning "doing well"), but even a cursory glance shows that it is not arguing that non-distributed high performance computing is relevant. I'm not sure what your post is responding to.

It is instead arguing that traditional HPC is being made irrelevant because traditional HPC uses MPI (the first successful distributed/parallel computing library), which is increasingly irrelevant in favor of newer libraries for the same task.