More evidence the Giza pyramids were built around 10,500 BC?

The Orion correlation theory suggests that the pyramids at Giza may have been built around 10,500 BC.  Basically the idea is that the three big pyramids at Giza match up to Orion's belt in the sky, and the timeframe is based on the location of the monuments being at the spot where the constellations would have risen on the spring equinox during the age of leo.

But I came across a video today that claims to have found evidence of a 10,500 year old date inside the Great Pyramid too.  Etchings that are supposedly a star map from that time period.  I can't vouch for the accuracy of the research, but it's an interesting piece if the subject of pyramid dating interests you.