Where are you getting this information from about "hundreds" of unresolved cases ?
How do you know the exact circumstances of each case ?
From the information you think you know, why are other attorneys or individuals being granted citizenship but Dr. Rubilar's clients, who according to you have similar circumstances, are not being granted citizenship? Are you suggesting discrimination by the judges against Dr. Rubilar? or sudden incompetence on the part of Dr. Rubilar?
I am asking this because I was one of Dr. Rubilar's first successful cases of going from tourist status directly to citizenship back in 2012-2013. He established the precedent that made these types of cases possible.
As part of the citizenship process as you may know, you must publish a notice in the newspapers that XYZ person is soliciting citizenship in Argentina. Rubilar has published hundreds of people in a particular newspaper, anybody can check the newspaper archives and see the clients that were published. Using that information you can easily go to the courts website and check the status of a persons case, you will see that the vast majority of his clients which had initiated the citizenship process and been published in the newspaper years ago have still not received citizenship and their cases are at a standstill.
To be honest I think it's a bit of both, Rubilars abrasive approach with the judges and the secretaries at the court are not winning him any good will, walking in and threatening everyone with being sued and fines, calling the court officials racists, Nazis and purveyors of slavery (these are literally the arguements he makes in his court filings).
In addition simple requests that the courts ask for, Rubilar refuses to comply with. One example being the newspaper publishings as I mentioned, the courts will tell you which newspaper to publish in and the exact message that has to be written. Rubilar instead published his clients in a different newspaper (that was cheaper for him) and made up his own message for the newspaper to write, instead of publishing what the courts asked.
Another (and the current issue for most of his clients) is the proof of income, which is a requirement in the consitution to receive citizenship. Rubilar is having his clients sign declarations that they brought tens of thousands of dollars cash over the border, without declaring it at customs like they should have, and they've been living off their stacks of cash for the past few years. The courts are responsible for weeding out any drug traffickers, human traffickers and other types of criminal elements from receiving citizenship. Understandbly when people are unable to explain how they earn a living and that they just live off cash they brought in illegally without declaring it at the border it makes the courts unsettled, and not only are those cases not progressing, some clients have had their cases reviewed and then the judge declined them without giving them an opportunity to correct it or add additonal evidence.
As the courts mention in all citizenship filings, applying for citizenship is gratis (apart from the newspaper publishing which you pay the newspaper for) and does not require any type of gestor or lawyer, it can be managed by yourself for free. The fact that clients of Rubilar in the past have received citizenship with his "help" doesn't mean that they wouldn't have been able to do it by themselves or with other lawyers and achieved the same or most likely an even faster result.