"Of course it's a coincidence" doesn't leave me with good feels. See, we don't know what a "normal distribution" is for a correlation like this, it's not like we have a huge bag of samples to determine the variance from.
The pyramid exists on every latitude between 29.9782000 and 29.9801000, it's not that precise.
The conspiracy theorist inside me would say that the French might not be the first to define the metric this way /s.
It's just that the French left the greastet Easter Egg of all time when creating the Metric System. They could've just made speed of light some round number, e.g. 1 million km/sec, but that sounded too bland, so they chose the Great Pyramid of Giza instead. The same for the charge of the electron