Does the kalphite soldier in the treasure room poison people just like the real one in the kalphite lair?

Yes since it does not matter where it is found.

Wow I didnt expect a reply so fast, thanks that seems logical but I would like someone who actually has built one in their dungeon to tell me for sure. :)

Go read the beastiary on any Kalphites. I guess that'll clarify the issue.

Things may be different for the dungeon version of the kalphite soldier though, thats what i'm wondering. Things are already different from the outside world since you cant die and the monsters don't count for slayer xp or combat xp, and have no drops.