"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.
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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