> Anyway, I would be really surprised if die-hard thoughtless style prescriptivists thought that the advice "don't use the passive voice" was meant to apply to participles.
Presumably you mean phrases including participles, not participles by themselves. But https://languagelog.ldc.upenn.edu/nll/?p=2922 "The passive in English" says:
> The relevance of participles is that a passive clause always has its verb in a participial form.
So, what are you saying they do think it was meant to apply to, if every passive clause always includes a participle? I'm confused.
With respect to:
> Though I wouldn't say the same thing there; if you say "the points that are already made", that pretty much has to be an adjective. If you want it to be a passive verb, go with "the points that have already been made".
the passive-clause examples given in Pullum's blog post I linked above include "Each graduate student is given a laptop," which sounds structurally identical to your example (except that an indirect object is present, showing that it cannot be an adjective) and clarifies:
> The verb was doesn't really add any meaning, but it enables the whole thing to be put into the preterite tense so that the event can be asserted to have occurred in the past. Changing was to is would put the clause into the present tense, and replacing it by will be or is going to be would permit reference to future time; but the passive VP damaged by storms would stay the same in each case. (Notice, the participle damaged does not itself make any past time reference, despite the name "past participle".)
So it sounds like your grammatical analysis is explicitly contradicting Pullum's, which probably means you're wrong, but I'm not sure I understand it.