I’ve been a nickelback fan for many years now and I know he isn’t lip syncing, I will admit it does sounds close to the original but in some parts I notice it’s not the same as the studio version.
his lip syncs perfectly with his voice and he doesn't riff the word "this" 2:21 on the second line of the chorus except for the last one 4:46 but in the studio version, he does it for all the choruses.
Play the studio version, then play this version. listen closely for some differences. Believe me, I thought this was lip syncing until I played both versions