[cyberlimerence]

Does Loeb plan to apply this thesis to every interstellar object ?

[SideburnsOfDoom]

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".

[TheOtherHobbes]

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

[moi2388]

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

[s1artibartfast]

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