That's certainly what the text says, but not what I think the author meant. Â In the description I quoted, the characters are 300 miles up the mountain (which is supposedly "half-way up") looking down on the ruins below.
I'd say the ruins cover a large section on the east side of the mountain...
According to the adventure module, Return to the Tomb of Five Corners:
"The ruins surrounding the gate [of auspicious passage] and the statue are the ruins of the City of Meru, the capital of the Solar Deliberative that once covered the whole of the Imperial Mountain and was destroyed in the...