If you're PAL on PAL you shouldn't need to do much of anything. The "fix" in that thread is slightly confusing.
You're going to need to boot the game using alternate dol. If you're using a newer build of LoaderGX you can just go into game options, use alternate dol, use dol from disc. It may pop up a window and have you select which dol. It'll be obvious.
The game boots up, you watch it the stupid here's how to do the obvious. It'll take a few minutes. It'll reboot you when done. Afterwards go in and turn off alternate-dol, and turn on 002 fix. Done.
If you run into some problem just post in here.
edit: Also, if you downloaded a scrubbed copy it's not going to work because said video wont be included. However, if you've watched the M+ video on TW, GST, or WSR-J, you can skip that step anyway.