Why would it? Gifting restrictions on games bought at the Steam store are completely different compared to restrictions put on keys. They would post information that is untrue for their store and is valid only for other stores. And as bad Valve is, nobody can expect a service to disclose information about other, similar services.
As for Humble, their policy is that you should buy games only for yourself or for people in the same country. The fact they even provided some detailed explanation on region locks is a small miracle, considering their previous track record of only disclosing usch information after sending a support ticket.

Sadly, it is a situation where Humble's policy is working against you, and working against you quite a lot. So, you either have to be careful and try to look for such information on key region locks, or you will continue to run into such situations on SteamGifts—especially with keys from certain publishers (and the publisher of that bundle, Deep Silver, is probably the most notorious in this regard).

I dont think you understand how the region lock thing works mate :p

If it was from HB then it should have worked. That winner (now suspended, i don't know why) is from Poland. His country is listed as fine with the Humble key for this game. If not from HB as you say here. Then it should have had the restrictions listed where you bought it.

I have no idea what happens now in regards to the suspension. Reroll I guess?