Ehh, yes an no. For some it can absolutely be what they consider as their real self but for many it’s the same thing as with any other content creator - a persona. It might be closer or further away from how they are in real life but I don’t think one should take what VTubers do as a complete truth. At the end of the day they (especially the larger ones) are entertainers and some amount of “fakeness” will almost always be present. Not many people can be entertaining enough purely through their “normal” personality to build and sustain a community around themselves.