A lot of the advice you get about how to be charismatic is about presence. It covers things you should do in real time to create an aura of magnetism. Henrik Edberg, for instance, tells us to focus on things that will make other people feel good: smile, be confident, be interested in them. Andrew Leigh's book, meanwhile, counsels us to put energy into making eye contact and to act more deliberately.
Now, a lot of this is good advice for improving our social skills. Confidence, warmth, positivity, fluency are all things that are welcome in social interactions, and are frequently in evidence in people with a charismatic reputation. But they are not the same as charisma. Not all socially confident people come over as charismatic; not all charismatic people are positive or charming.
I can hear your ‘yes, buts’ bubbling up already. You want to tell me about X conductor or Y civil rights leader who had the most remarkable presence. And I believe you. But I would also contend that that aura is not the source of their charismatic power; it is at most a by-product of it. Charisma does not inherently require presence because it can work even when you are absent.