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The three known interstellar object to pass through the solar system were 1I/ʻOumuamua, 2I/Borisov and now 3I/ATLAS.

Did he give Borisov this treatment? It seems not, so then the answer is "no, only about two thirds of them".

Even so, the probability that Loeb will hint that 4I/whatever could be a probe approaches certainty.

Not just interstellar ones, also any rock you might find on the ocean floor..

Seems like it, why not. The paper says it is provided as a guide for future interstellar object.