"... if there is a world-wide oil glut, the increased US production must certainly take part of the blame for it. "
Blame? Blame you say? I think CREDIT is the word the author was after. Or maybe not. One man's glut is another man's salvation.
Keep in mind, this guy sells to the oil companies. His business will be hurting. It is perspective. And this bust looks like it may be extensive and painful.