Well I see a bunch of words, but no proof that this is how it's done, so this means nothing, my friend. Plus how do we know that code even has anything to do with VAC? pull it apart for us, explain what it is doing.
In layman terms.
It calls your DNS cache and it transforms it into MD5 hashes before sending it away.
You can find this module on your own if you catch all VAC modules when starting steam.
There's enough info on the internet on how to do it. I won't be linking it because most results on how to do it are also providing cheat related content
Also don't tag someone with 'dumb' if you cant understand it.