That site is absolutely not worthless. Crinrict has been helping troubleshoot Sims 3 issues since the beginning and knows exactly what she's doing. The whole point of Method by Mell is to remove most of the content from the launcher so whatever is causing the crashing is hopefully out of the way. If the one .dbc file you're looking at causes a crash, take it out and try a different one.
If your launcher crashes even after you've removed all the .dbc files, then there's something else wrong with it. The launcher doesn't exactly read the contents of Library, although it does display Library content you've installed through the launcher, i.e. downloaded houses or lots. Still, you could remove the entire Library folder and see whether it helps.
Or you could start with a fresh user data folder and start adding back your content. Move the entire Sims 3 folder out of Documents\Electronic Arts and onto your desktop, then open the launcher to create a clean one. Method by Mell would still work here, as would gradually adding other content to the folder.