If you use the waybackmachine you will see that the information provided at the top of the page is the same in the year 2000.
The effect was added at some point, but Im 100% sure myself no lvl 1 should poison untill well after velious.
If it were more important I would put more time into it, but its just not lol.
http://web.archive.org/web/200010291...h.shtml?id=415
My guess is it was changed during prophecy of Ro expansion. /shurg