I understand the reason everyone is saying that tapping the stick is bad, but at the same time I highly doubt it's as big a deal as we all make it out. I mean just because he calls for the puck doesn't mean he's going to get it, and if the sound does call defenders' attention then that means their attention is being diverted from elsewhere. Imagine the center has the puck, Pulk taps his stick, then the center passes to the opposite winger who has an instant more of freedom than he normally would have because everyone is paying attention to the stick-tap.
Or imagine that the defense is aware of this "tell" that Teemu has so they're actively listening for the stick-tap, meanwhile he silently jumps into the slot one time and has an extra instant of freedom to score.
In any case the game happens so fast and so much can happen that I don't think the defense can reliably use the sound as an advantage, at least as long as Teemu is moving around and playing smart.
If anything I'd be more worried that he's so busy tapping that he's not ready to accept a quick pass. But that hasn't seemed to be a problem for him.