While we can quibble over terminology, I think the ball JP threw to Evans demonstrated some serious deep touch. And like JSP says, Drew may have been able to throw the long ball, but he struggled on screens and intermediate throws. Even the first TD that he threw last Sunday to Keyshawn was well behind him. Keyshawn made a great play on that ball and saved Drew's bacon.
I don't think it's so much that Drew "lost zip" on his shorter throws as OP said. I think it's more that Drew has always been so in love with his long ball that he never developed the touch on intermediate and short passes that a quarterback needs, particularly in a Mularkey/Clements offense. It looks like he thinks all he needs to do to throw the short ball is to take some mustard off his pass. In that way he's a lot like a speedy wide receiver who excels on go routes but moseys across the middle instead of cutting hard and running fast.