Source for this claim? Not all supercomputers are miners. Indeed, the vast majority are not.

And even if the Iceland installation is a mining effort, there is a reasonable alternate conjecture - the private keys were fully entrusted to the other dude before he died, leaving Wright with no means of accessing the BTC1.1M. This might lead our Dr Wright to be desirous of a BTC stash. Note I am not making this claim, just that there could be alternate reasons for seeking more BTC.