Re: sims 4 not launching
First off, afaik, you don't change mods with S4S, you create and change CC with it. What this sounds like is that you changed something in your mods folder and that is what is keeping the game from running. My guess is that it's probably some type of default replacement, but it could be anything really. The good thing about S4S is that it doesn't alter the original files, it puts them in a backup folder in the S4S folder in Documents and writes new copies of them with your changes in the mods folder. So, you should have a backup unless you saved things twice.
I did about the same thing a while back. My game would start afterwards but sims looked really wonky. It took me a couple of days to find that the problem was default replacement feet that the batch fix altered. Putting the original file back fixed it. So, lesson learned was to separate all my default replacements out, so I don't run a batch fix on them ever again.
To fix this, you are going to have to go through your CC now and figure out which file or files that got altered are giving you the problem. Then replace those with the originals from the backup folder, from the original downloads, or download them again. You might be able to just copy all the backup files that were moved to the backup folder over their copies in the mods folder then start again with your project to get rid of the random tags. Up to you how you do it.
Hope this helps.