Is the idea that Egyptians built pyramids by rolling stone on logs a fact or hypothesis?

The idea that Egyptians built pyramids by rolling stone on logs is a hypothesis.

While it is a plausible explanation for how the ancient Egyptians were able to move and place the massive stone blocks used to construct the pyramids, there is no definitive evidence to support this theory. It remains one of several competing hypotheses about how the pyramids were built.