Yeah but at LAN everyone will be having the same bollox. 1 of the things in his guide is backed up by many users on nvidia forums though, the scaling. By all means use your display's built in scaling or even better, if you're planning on playing on native resolution (in which case scaling is not required), turn it off.
HPET personally isn't causing delay after doing loads of testing with it imo. It does however caus a subtle change in how your mouse feels. The more accurate the timer, the more accurate it feels but also slightly slower somehow.
Tinker with HPET combinations at your own desire, keep in mind having it ON in the bios and disabled/enabled in windows is also a valid combo, there's at least 3 possible variations in timing methods.