No nodes build by anyone, and this goes as well for what can be found at https://thebuildingcoder.typepad.com for Revit plugins can create project parameters as it can be done inside Revit. Why noone in the Revit team has found it applicable to provide us with this option I really cant say.
This is why I mentioned for @Michael_Kirschner2 that the dynamoteam should remove the input option concerning “group”, since it makes no sence from a “ProjectParameter” point of view. This issue is filed at DynamoDS Github.
The remaining part is that all you have been writing indicates that it is not a Project Parameter you ask for but a Shared Parameter you can add to the project. This will inside the project act as a Project Parameter with some benefites.
Since noone besides the Revit team can add real project parameters it really doesn’t matter, since you one way or the other will get these parameters as shared parameters.
So instead of having troubles with trying to add project parameters, add Shared parameters instead.