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Yes, but the rule clearly states that the ball has to be visible at all times without exception, regardless of whether it's before during or after contact....I think it's probably very difficult for the umpires to see that the pendulum serve goes behind his head, only back cameras so far have been able to detect that. You mentioned earlier that there's some faint moment in time where the ball is visible.
Unlike the shovel or hook serve that looks obviously shorter than a normal toss, and has some head arm action going on.
Lin didn't stop using his hook serve though, It's also very interesting that today WCQ stuck to the pendulums.
LYJ didn't use the traditional low toss hook serve, the one he was serving was more the high toss version which can't generate significant topspin - most of the variation is between heavy underspin to no spin or light sidetop.