PS2 Looking for a Widescreen hack tutorial

[El_isra]

I've found this tutorial to get widescreen hacks:
https://www.ps2-home.com/forum/viewtopic.php?t=7777
Could anyone tell me if this guide is correct??

I want to make the widescreen hack for a Spanish-moded Kingdom hearts 2 final mix [SLPM_666.75]