Is "said" an adjective in the noun phrase "the said people" and a determiner in "said people"?
You might get different answers from different people. I see that Wiktionary classifies these usages exactly as you suggest, but other dictionaries, even ones that recognise the "determiner" class, do not classify "said" as one. On the basis that determiners should, in the broadest sense, "locate" the noun, and adjectives should specify some property of it, I would say that "said" in "said people" should be a determiner.
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You might get different answers from different people. I see that Wiktionary classifies these usages exactly as you suggest, but other dictionaries, even ones that recognise the "determiner" class, do not classify "said" as one. On the basis that determiners should, in the broadest sense, "locate" the noun, and adjectives should specify some property of it, I would say that "said" in "said peo