C17 Lands at wrong (3600 foot!) runway

[500N]

I saw written somewhere in one of the articles that the C17 weighed
some huge amount (400,000 lbs ?) yet the airport runway was
only rated for a number way way less than this (20,000 lbs ?).
Hopefully not the media getting the numbers wrong.

With such a huge difference, how come no damage was done to the runway ?

Reason for asking is I once saw what happens when a C130 sinks through
the asphalt / tarmac on landing at an airstrip rated for Hercs but that had obviously not been checked in a while. Not sure what happened on take off
as never went back as it was in the middle of no where (Woomera Rocket Range).

Thanks.