Surely a nice initiative, and we should support it. My only note is that the message is a bit misleading. I will try to clarify.
Generally speaking, you can support PS by making a donation to PS directly. See our help pages on main web site.
Jorrit is the main developer of Crystal Space, the 3d engine PlaneShift is using.
Apricot is a different project, not created by PlaneShift team, hopefully not a fantasy mmorpg

(details are still in definition stages).
Apricot is based on Crystal Space, the same engine PlaneShift is using. So if another game gets built on the same engine, the engine will be improved and so PlaneShift will also benefit from it indirectly (depending on the features they will add).
Having said that, full support to Jorrit and the Apricot project!