> so that would deprecate both of these:

No, I don't think it does. I say "ellipsis parameter", which is an
parameter that is an ellipsis (i.e. C variadics), not "an ellipsis
within the parameter list".

To my knowledge, we don't have an actual standard name for this
construct. Perhaps something should be done about that editorially.

Your proposed wording is more concise, I like that; and yeah, I've
missed Annex D.