To be considered vaccinated, one has to receive two doses, with a minimum timeline of 14 days apart. You can't receive a flu shot or any similar vaccine during the process. I don't know how far along he was, but assuming he was shown getting the vaccine, he still had the second shot before he was through.
Really, I don't know what else was going on with the 86-year old to where he is no longer with us. The news of his passing just broke today, so I'm going to let the time pass before the causes are made public. I'll leave the speculation to those that handle it, but whatever happened, the MLB community, if not America and Planet Earth lost a true icon, a role that he had before, during, and after his Hall of Fame Career.
Hank Aaron will always be the home run king to me as well. What's on paper/documented is what it is, but in his playing days what he did was more than spectacular. The constant pressure of just playing the sport, let alone going for and eventually passing Babe Ruth was phenomenal. He handled it with such class and took it. I can't imagine that happening today.
I remember when Hank did a commercial encouraging Barry to "ride off into the sunset" after he broke McGwire's single-season record, and Bonds was having none of it. Eventually Aaron was classy about it, IMO after the 2007 season. More than Bug Selig, that's for sure!
RIP, Mr. Aaron.