I don’t understand how it “infers that Jesus is not alive.” First, asking what someone else you use as an example would do does not suggest anything about their state of life or death. I could ask myself, “What would Warren Buffett do when faced with this financial market?” and he’s still alive. Second, in the specific WWJD case, Jesus is obviously also “alive” in the sense of working through the person trying to emulate him.
I could see objecting to this slogan as being commercialized, but this bishop sure seems to be overthinking a slogan that works for many.