No, the fact that the coordinates of the Giza pyramid align with the speed of light (299,792,458 meters per second) is purely coincidental and does not suggest that the ancient Egyptians had knowledge of the speed of light.
The idea that the coordinates of the Giza pyramid somehow encode or reflect specific scientific or mathematical knowledge is a form of pseudoscience and a result of selective interpretation. It is important to approach such claims with skepticism and critically evaluate the evidence and reasoning behind them.
The ancient Egyptians built the pyramids for various reasons, primarily as tombs for their pharaohs. The design and construction of the pyramids were based on the architectural and engineering knowledge available to them at that time. The alignment of the pyramids with cardinal directions, such as the north-south axis, can be attributed to their cultural and religious beliefs rather than scientific knowledge of specific numerical values.
It is worth noting that the speed of light is a fundamental constant of nature and was accurately measured for the first time in the late 17th century, long after the construction of the pyramids. The ancient Egyptians did not possess the scientific instruments or concepts required to measure or understand the speed of light in the modern sense.
While historical civilizations made significant advancements in various fields, attributing specific scientific knowledge or discoveries to them without solid evidence can lead to misconceptions and misunderstandings. It is important to rely on verified historical records and scientific evidence when discussing such topics.