A crucial thing being missed here is most of the present discourse (as far as I've seen) happens between people who are uncertain about it but do think it is possible that an AI might be conscious now or in the future and this should be taken seriously, and people who totally rule out the possibility that an AI might be conscious now (or, in many cases, ever). Then the philosophical picture starts to look very different.
PS the whole "a group of things [can't] share an internal world" spiel is weird and just plain wrong IMO. Humans could perfectly well share an internal world if the technical means were there. The author has not yet realized that the idea of "the self" as a single well-defined and enduring object-type thing is only a convenient illusion created by our minds. Alas, the style of the piece does not really lend itself to a coherent counter-argument, it would be a useful companion piece if the author simply laid out their personal beliefs on this matter plainly.
PS the whole "a group of things [can't] share an internal world" spiel is weird and just plain wrong IMO. Humans could perfectly well share an internal world if the technical means were there. The author has not yet realized that the idea of "the self" as a single well-defined and enduring object-type thing is only a convenient illusion created by our minds. Alas, the style of the piece does not really lend itself to a coherent counter-argument, it would be a useful companion piece if the author simply laid out their personal beliefs on this matter plainly.