Seems like an unnecessary exercise in semantics. His abilities to throw hard, maintain his velocity, strike batters out, get out right handers, keep the ball in the park, etc. are all declining. Doesn't matter whether you prefer to call some of those abilities and other ones production, the results are the same.
His ground ball rate is the lowest he's had since 2009, his fly ball rate is the highest it's been since 2009, his home run rate is the highest of his career.