1

ban dis dude. And baibai :)

is the site, that I somehow have a ref link for, legit?

No. Google says it's related to a keye.pl, a key site like g2play (and those other cdkeystore sites) that tells you to download VPN software to activate games. Any site that has any game, even 1, that it says "must use VPN to activate" is not legit and in violation of the Steam TOS. Avoid all of those unauthorized resellers.

yes I register to the site why?

i have bought plenty of times from sites like these.Once steam revoked my key but they gave me another from the site i bought it.So decide yourself

Call of Duty: Ghosts STEAM CD-KEY RU
So no, not trustworthy.