@dmacay95 The original technique was for recovering the sims that were active the last time you saved the game. I didn't realize there were other sims in the town that you also wanted back. The data for each save is spread out among several different files, and any one of them could potentially be the issue. So, if you want to experiment, you could use the same approach as before to replace one of those files at a time, testing to see if you get a usable game that includes all the sims you care about. Unfortunately though, it's possible that the data you want is already too corrupted to recover.
I'm sorry that there isn't a more useful way to approach this. The unfortunate fact is that saves get corrupted, and sometimes they're too far gone to repair. In the future, aside from keeping backup saves, you might want to look into adding mods to clean up your game. There are a few that don't change gameplay at all, they just remove bad data and reset stuck situations when necessary. It's the only way many of us have been able to maintain games over a number of generations without having to periodically transfer our sims to a clean save.