There was a commit a couple years ago that cleaned up how total functionals were built from their component parts (e.g., B3LYP = B3 + 0.81 * LYP + 0.19 * VWN3 …). It cleared up a parameter-definition ambiguity but made it impossible to define SCS-DH functionals purely within the functionals spec. Being unable to specify those functionals you listed, they were removed from the functionals list. No one among the developers has needed them since, so they’re still off the list (though, naturally, we have a ticket, https://github.com/psi4/psi4/issues/39).
You’re the first person who’s wanted them, so thanks for the interest, though I can’t promise we’ll get to them soon. If you uncommented the relevant pieces from functionals.py, what I would expect you would get is the proper underlying functional (the hard part) with the SCS applied incorrectly or not at all (that is, a plain DH). An ad hoc means of computing these wouldn’t be hard.