Do you think these are some kind of hoax?
These days I suspect EVERYTHING is a hoax.
Even small earth tremors can cause rock to shift - not necessarily so much as to cause a rock slide, but certainly enough to throw off the accuracy of a solar calendar painting.
It is remarkably precise - the shape and location of the “arrow” of light relative to the painting is perfect.
That means that in the time since the figure was painted, NO change, no matter how minute, has occurred to the location or shape of:
1) the rock face where the figure is painted, and
2) the rock formation/hole-in-the-rock/space-between-rocks which cause the shaft of sunlight to appear in the painted area at exactly the same time every year.