How would it be possible for anyone who has been denied entry and "deported" to get a certificado de domicilio which, if I remember correctly, must be applied for in person at a police station in CABA or, at least where I now live, at the appropriate registro? I don't think that anyone, including a lawyer, can ask for a certificado de domicilio on behalf of another person, and, when applying for citizenship, the last time I got one, certificado must be presented within a very short time after it's issued.
Based on posts by Bajo_cero2, it looks like a lawyer can solicit a judge to override the denial of entry and/or the release (into Argentina) of a foreigner who is being detained by migraciones based on the argument that, by virtue of already "living in Argentina" (albeit while overstaying a tourist or digital nomad visa or perhaps also an expired temporary residency that for some reason could not be renewed).
The argument appears to be based on the provisions of the Argentine National Constitution and I believe that he has successfully used this tactic a number of times, but I have no idea how many times either way. I think that this is what he's doing now for two of his clients who were recently denied entry. I assume that they are both applying for citizenship. If they aren't, I don't know why they would be his clients. He has indicated that he developed this strategy, which others may since have tried to copy.
I realize that Vossos is not interested in applying for citizenship at this time, so I can only hope he will be able to find a lawyer who will have the ability to successfully represent him as an "inhabitant" of Argentina at a Federal Court, if that's what it takes to "force" migraciones to reverse the ban on entry.