Yeah they replaced all the tasks that require other people for ironman. For example, for the do a sinkhole task we just have to find one. For the feed a teammate task, we have to attempt to feed a familiar (which won't work, but will complete the task).
Source: in-game and http://runescape.wikia.com/wiki/Daemonheim_Tasks While other people might not like that they are changing stuff around to accommodate Ironman modes ("They chose to limit themselves" and stuff), I for one are very glad they are making such changes.