Frankly I cannot spot any relative latency in audio between the two guitar channels/parts, or the drums/bass backing track. And since the mixing was done via Ardour, I doubt there is a problem there. Never had any issues with ardour. Unless I am missing smth here.
If you mean the last 5 seconds, this was done on purpose, I tried to play some new riff timing there, turned out this indeed sounds off, but I was too tired to redo it.