Oh FFS, chill out, will you? I know what you're saying. (And yes, Web filters are exactly that dumb. Always have been, always will.)
have 100's of domains pointing to the same "code" to avoid getting blocked.
googleit.tk points to the content on deadlabtop.tk right (which is the only logical explanation for why clicking on googleit.tk/whatever takes you to deadlabtop.tk/whatever)? As far as I know, there are two primary ways of doing this:
1) Parking a Domain on your webhost to redirect traffic or...
2) Redirecting all the alternative names to the main site via your domain registrar.
Either way you are redirecting traffic. I call it a redirect because the INTENT of the domain name (and now I'm talking 20+ years ago intent) was one domain == one site. You want 100 domains == one site. There are perfectly valid reasons for doing this, but at the end of the day, you're pointing content around.
Now. If you're done being a git about THAT, we can get into why this DOES NOT work how you want it to on Single Site WordPress.
Generic WordPress has a field for ONE domain name and one only. From that setting, it generates all it's internal URLs. Because of that, you really can't do this with Single Site WordPress.
Can you with MultiSite? Maybe.
Nothing you've said up until 'being I seen my site as multi site' has ANY indication you're currently using MultiSite. If you are, you can map domains to various sites on your network via a plugin. In THEORY, you MIGHT be able to map all the domains to the SAME site, to mimic that behavior.
I leave this to Andrea, though, to explain if that's a smart idea. She's MUCH better at the domain mapping stuff (since she's kinda one of the brains behind it).