preloader is not completely unnecessary as it contains specific hacks that a lot of people use, like removing healthscreen and turning of that damned nintendo background music. And most important the skip disc update option.
You do need to specify that you can download bootmii (hackmii installer) on bootmii.org, and not only use the hombrew channel option in it, but also the bootmii part so people can save there nand before they try anything else on their wii. And also something about ios and ciso downgrader stuff. if they wanna play backups with usbloader..
there are more flaws which i wont even go into, people are best off using other guides imo, they wont get far with your.