This has some real "if Obama was an actual citizen with nothing to hide, he would just share his long form birth certificate already," energy.
People were saying he was dead. He posted a photo. People screamed "that evidence isn't good enough, we need more evidence!” If he posted a video, people would say it's just AI. If he had someone come see him, people would just say they're a paid actor.
This is how conspiracy theories work. No amount of evidence is ever enough to convince you that the thing you want to believe isn't true. Feeding evidence into that machine is an exercise in futility, which is probably why he isn't engaging with the conspiracy theorists.