Here is a bunch of text that is within the template. For example, this template could mention that this page is part of a translation that is underway. And we want to automatically capture the signature of the user, and the timestamp. That requires a subst, but we don't want the subt to happen within this template. Hmm. Trying to surround the subst with includeonly: Okay, this is after the include only.
What the heck, also try putting 4 ~'s within "include only". Done. See if that works.