This could be tangible evidence of the existence of our Lemurian ancestors, and the possibilities neither contradicted with the consistency of my personal researches (click Lemurian Timeline).
The huge size of the footprint may be reflective of the original larger Planet that once orbited in presently known Asteroid Belt prior to cosmic collision as narrated by Mindanao's Samal Tribe and by ancient Sumerians, its larger mass and planetary gravity enabled sustaining such gigantic Paleozoic era inhabitants.
Despite South Africa being a far distance from the location of ancient MU/Lemuria in the present-day Pacific Ocean, post Permian-Triassic geography was vastly different with continents once attached with each other that comprised the supercontinent Pangaea. Only about 225 to 200 million years ago did the supercontinent began to break up (after the disappearance of supercontinent MU/Lemuria) and continental Drift occurred that formed the present day locations of separated continents.
The granite rocks carbon dated at more than 200 Million years yet still in fluid form may possibly signify an aftermath of the Permian Triassic Extinction Event and vividly portrayed a horrific scorched land that almost extinguished lifeforms during the troubling era, and for such a footprint to be embedded on a scorching lava may had dramatized the solid determination of a very ancient survivor.
With distinct humanoid shape of the foot and most possibly manifesting bi-pedal posture, Humanity's ancestral survivor who existed hundreds of millions of years before the mammalian species evolved must have possessed a biological structure adept with the harshness of his/her Paleozoic environment. While the mammalian species were yet to appear and reptilian creatures still roamed, Evolution had utilized much on the latter as to mold such hardy native survivor able to withstand barefoot and tread on hot muddy granite in fluid state. Even the Greek Philosopher Socrates narrated the physical prowess of Lemurians, hinting of their capability to "challenge the gods."
(Artist's rendition of an ancient Lemurian native, with pet dinosaur.)