no, this is not correct. you don't need perfect pitch to speak proper chinese, it's about the relative pitch contours. C vs E vs G has nothing to do with it. and native chinese speakers are not conceptualizing it as "pronunciation" + "pitch" as two separate things that exist alongside each other. the pitch is a fundamental part of the pronunciation, not external to it

i dont know japanese but it sounds like your example is just saying that japanese humor has a lot of puns