No need to be so hard on him. I daresay most folks had never heard the hymn before Cat recorded "Morning Has Broken". Actually the words to the song are quite lovely, and full of praise for God's Creation.
But, seriously, if you're going to write an article complaining about hymns -- then pick up a couple of books (or even go on line! you can research hymns at Oremus.com or the CyberHymnal: authors (with biographies), composers, the works) and make sure you've got your facts straight.