The Federation (Or at least Ishan) seemed to object to giving the Andorians the cure, because it contained a small faction of the meta-genome data and considered it a security risk. Wouldn't this be a moot point, since Andoria already had a copy of the meta-genome data anyway? So they'd just be giving Andoria access to data they already had. Granted, the scientists didn't have complete access to all of the data. Or claiming it was a security risk was just a smokescreen and it was more about spiting Andoria for leaving the Federation?