Sum41 are posers. I can assure you there is NO tapping involved whatso ever in any of their songs. No matter what that dude does in those videoclips. I've read somewhere they were on a concert and that singer said 'Do you like Heavy metaaaal' and I thought they were a punkrock band ? But ofcourse that's just my opinion. If that song helps you to play some cool 'REAL' tappinglicks be my guest. I'm surely not gonna discourage you then ! But if you're going like: 'I wanna learn guitar to play just like Sum41', then you have my weldeserved middlefinger and my boot up your arse :)